Issue:
Bug: Handle optional fields in nexixpay payments requests.



Optional billing details should be used for non-mandatory billing fields.

Pull request description:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [ ] New feature
- [ ] Enhancement
- [x] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
Optional billing details should be used for non-mandatory billing fields. Billing address is optional field for making requests to nexixpay. Either billing.first_name or billing.second_name should be present mandatorily.

Includes ENV changes related to support of currency and country for nexixpay connector. 

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

<!--
Provide links to the files with corresponding changes.

Following are the paths where you can find config files:
1. `config`
2. `crates/router/src/configs`
3. `loadtest/config`
-->


## Motivation and Context
<!--
Why is this change required? What problem does it solve?
If it fixes an open issue, please link to the issue here.

If you don't have an issue, we'd recommend starting with one first so the PR
can focus on the implementation (unless it is an obvious bug or documentation fix
that will have little conversation).
-->


## How did you test it?
<!--
Did you write an integration/unit/API test to verify the code changes?
Or did you test this change manually (provide relevant screenshots)?
-->

- Curl to test the optional billing address.
```
curl --location 'localhost:8080/payments' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'api-key: dev_RFY4WCFOFu2eEmA13QTQGzHyyjIvaTgdTqKsp2yBy4ofwyZ7fdyIMIJKHcHzGbC5' \
--data-raw '{
    "amount": 3545,
    "currency": "EUR",
    "amount_to_capture": 3545,
    "confirm": true,
    "profile_id": "pro_56hlX3G8qT0Fz4qlqO2J",
    "capture_method": "automatic",
    "capture_on": "2022-09-10T10:11:12Z",
    "authentication_type": "three_ds",
    "setup_future_usage": "off_session", 
    "customer": {
        "id": "customer123",
        "name": "John Doe",
        "email": "customer@gmail.com",
        "phone": "9999999999",
        "phone_country_code": "+1"
    },
    "customer_id": "customer123",
    "phone_country_code": "+1",
    "description": "Its my first payment request",
    "return_url": "https://google.com",
    "payment_method": "card",
    "payment_method_type": "credit",
    "payment_method_data": { 
        "card": {
            "card_number": "4349940199004549",
            "card_exp_month": "12",
            "card_exp_year": "30",
            
            "card_cvc": "396"
        }
    },
    
    "billing": {
        "address": {  
            "first_name": "joseph",
            "last_name": "Doe"
        },
        "phone": {
            "number": "8056594427",
            "country_code": "+91"
        },
        "email": "guest@example.com"
    },
    "statement_descriptor_name": "joseph",
    "statement_descriptor_suffix": "JS",
    "order_details": [
        {
            "product_name": "Apple iphone 15",
            "quantity": 1,
            "amount": 3545,
            "account_name": "transaction_processing"
        }
    ],
    "browser_info": {
        "user_agent": "Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/70.0.3538.110 Safari\/537.36",
        "accept_header": "text\/html,application\/xhtml+xml,application\/xml;q=0.9,image\/webp,image\/apng,*\/*;q=0.8",
        "language": "nl-NL",
        "color_depth": 24,
        "screen_height": 723,
        "screen_width": 1536,
        "time_zone": 0,
        "java_enabled": true,
        "java_script_enabled": true,
        "ip_address": "128.0.0.1"
    },
    "customer_acceptance": {
          "acceptance_type": "online",
          "accepted_at":"1963-05-03T04:07:52.723Z",
          "online": {
            "ip_address":"127.0.0.1",
            "user_agent": "amet irure esse"
          }
    },
    "connector":["nexixpay"],
    
    "connector_metadata": {
        "noon": {
            "order_category": "pay"
        }
    },
    "payment_link": false,
    "payment_link_config": {
        "theme": "",
        "logo": "",
        "seller_name": "",
        "sdk_layout": "",
        "display_sdk_only": false,
        "enabled_saved_payment_method": false
    },
    
    "payment_type": "normal", 
    "request_incremental_authorization": false,
    "merchant_order_reference_id": "test_ord",
    "session_expiry": 900    
}'
```

## Checklist
<!-- Put an `x` in the boxes that apply -->

- [x] I formatted the code `cargo +nightly fmt --all`
- [x] I addressed lints thrown by `cargo clippy`
- [ ] I reviewed the submitted code
- [ ] I added unit tests for my changes where possible


Testing:


- Curl to test the optional billing address.
```
curl --location 'localhost:8080/payments' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'api-key: dev_RFY4WCFOFu2eEmA13QTQGzHyyjIvaTgdTqKsp2yBy4ofwyZ7fdyIMIJKHcHzGbC5' \
--data-raw '{
    "amount": 3545,
    "currency": "EUR",
    "amount_to_capture": 3545,
    "confirm": true,
    "profile_id": "pro_56hlX3G8qT0Fz4qlqO2J",
    "capture_method": "automatic",
    "capture_on": "2022-09-10T10:11:12Z",
    "authentication_type": "three_ds",
    "setup_future_usage": "off_session", 
    "customer": {
        "id": "customer123",
        "name": "John Doe",
        "email": "customer@gmail.com",
        "phone": "9999999999",
        "phone_country_code": "+1"
    },
    "customer_id": "customer123",
    "phone_country_code": "+1",
    "description": "Its my first payment request",
    "return_url": "https://google.com",
    "payment_method": "card",
    "payment_method_type": "credit",
    "payment_method_data": { 
        "card": {
            "card_number": "4349940199004549",
            "card_exp_month": "12",
            "card_exp_year": "30",
            
            "card_cvc": "396"
        }
    },
    
    "billing": {
        "address": {  
            "first_name": "joseph",
            "last_name": "Doe"
        },
        "phone": {
            "number": "8056594427",
            "country_code": "+91"
        },
        "email": "guest@example.com"
    },
    "statement_descriptor_name": "joseph",
    "statement_descriptor_suffix": "JS",
    "order_details": [
        {
            "product_name": "Apple iphone 15",
            "quantity": 1,
            "amount": 3545,
            "account_name": "transaction_processing"
        }
    ],
    "browser_info": {
        "user_agent": "Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/70.0.3538.110 Safari\/537.36",
        "accept_header": "text\/html,application\/xhtml+xml,application\/xml;q=0.9,image\/webp,image\/apng,*\/*;q=0.8",
        "language": "nl-NL",
        "color_depth": 24,
        "screen_height": 723,
        "screen_width": 1536,
        "time_zone": 0,
        "java_enabled": true,
        "java_script_enabled": true,
        "ip_address": "128.0.0.1"
    },
    "customer_acceptance": {
          "acceptance_type": "online",
          "accepted_at":"1963-05-03T04:07:52.723Z",
          "online": {
            "ip_address":"127.0.0.1",
            "user_agent": "amet irure esse"
          }
    },
    "connector":["nexixpay"],
    
    "connector_metadata": {
        "noon": {
            "order_category": "pay"
        }
    },
    "payment_link": false,
    "payment_link_config": {
        "theme": "",
        "logo": "",
        "seller_name": "",
        "sdk_layout": "",
        "display_sdk_only": false,
        "enabled_saved_payment_method": false
    },
    
    "payment_type": "normal", 
    "request_incremental_authorization": false,
    "merchant_order_reference_id": "test_ord",
    "session_expiry": 900    
}'
```

Patch:
diff --git a/config/config.example.toml b/config/config.example.toml
index ad910ef415a..a95cc7c1405 100644
--- a/config/config.example.toml
+++ b/config/config.example.toml
@@ -618,8 +618,8 @@ debit = { country = "US, CA", currency = "USD, CAD" }
 klarna = { country = "AU,AT,BE,CA,CZ,DK,FI,FR,DE,GR,IE,IT,NL,NZ,NO,PL,PT,ES,SE,CH,GB,US", currency = "CHF,DKK,EUR,GBP,NOK,PLN,SEK,USD,AUD,NZD,CAD" }
 
 [pm_filters.nexixpay]
-credit = { country = "PL,CZ,RO,SE,CH,HU,US,GB,DK,UA,MK,BG,HR,BA,IS,RS,GI", currency = "PLN,CZK,RON,SEK,CHF,HUF,USD,GBP,DKK,UAH,MKD,BGN,HRK,BAM,ISK,RSD,GIP" }
-debit = { country = "PL,CZ,RO,SE,CH,HU,US,GB,DK,UA,MK,BG,HR,BA,IS,RS,GI", currency = "PLN,CZK,RON,SEK,CHF,HUF,USD,GBP,DKK,UAH,MKD,BGN,HRK,BAM,ISK,RSD,GIP" }
+credit = { country = "AT,BE,CY,EE,FI,FR,DE,GR,IE,IT,LV,LT,LU,MT,NL,PT,SK,SI,ES,BG,HR,DK,GB,NO,PL,CZ,RO,SE,CH,HU", currency = "ARS,AUD,BHD,CAD,CLP,CNY,COP,HRK,CZK,DKK,HKD,HUF,INR,JPY,KZT,JOD,KRW,KWD,MYR,MXN,NGN,NOK,PHP,QAR,RUB,SAR,SGD,VND,ZAR,SEK,CHF,THB,AED,EGP,GBP,USD,TWD,BYN,RSD,AZN,RON,TRY,AOA,BGN,EUR,UAH,PLN,BRL" }
+debit = { country = "AT,BE,CY,EE,FI,FR,DE,GR,IE,IT,LV,LT,LU,MT,NL,PT,SK,SI,ES,BG,HR,DK,GB,NO,PL,CZ,RO,SE,CH,HU", currency = "ARS,AUD,BHD,CAD,CLP,CNY,COP,HRK,CZK,DKK,HKD,HUF,INR,JPY,KZT,JOD,KRW,KWD,MYR,MXN,NGN,NOK,PHP,QAR,RUB,SAR,SGD,VND,ZAR,SEK,CHF,THB,AED,EGP,GBP,USD,TWD,BYN,RSD,AZN,RON,TRY,AOA,BGN,EUR,UAH,PLN,BRL" }
 
 [pm_filters.square]
 credit = { country = "AU,CA,FR,IE,JP,ES,GB,US", currency = "AED,AFN,ALL,AMD,ANG,AOA,ARS,AUD,AWG,AZN,BAM,BBD,BDT,BGN,BHD,BIF,BMD,BND,BOB,BRL,BSD,BTN,BWP,BZD,CAD,CDF,CHF,CLP,CNY,COP,CRC,CUP,CVE,CZK,DJF,DKK,DOP,DZD,EGP,ERN,ETB,EUR,FJD,FKP,GBP,GEL,GHS,GIP,GMD,GNF,GTQ,GYD,HKD,HNL,HRK,HTG,HUF,IDR,ILS,INR,IQD,IRR,ISK,JMD,JOD,JPY,KES,KGS,KHR,KMF,KPW,KRW,KWD,KYD,KZT,LAK,LBP,LKR,LRD,LSL,LYD,MAD,MDL,MGA,MKD,MMK,MNT,MOP,MUR,MVR,MWK,MXN,MYR,MZN,NAD,NGN,NIO,NOK,NPR,NZD,OMR,PAB,PEN,PGK,PHP,PKR,PLN,PYG,QAR,RON,RSD,RUB,RWF,SAR,SBD,SCR,SDG,SEK,SGD,SHP,SLE,SLL,SOS,SRD,SSP,SVC,SYP,SZL,THB,TJS,TMT,TND,TOP,TRY,TTD,TWD,TZS,UAH,UGX,USD,UYU,UZS,VND,VUV,WST,XAF,XCD,XOF,XPF,YER,ZAR,ZMW" }
diff --git a/config/deployments/integration_test.toml b/config/deployments/integration_test.toml
index 47b65efabc4..c84a68e0573 100644
--- a/config/deployments/integration_test.toml
+++ b/config/deployments/integration_test.toml
@@ -378,8 +378,8 @@ samsung_pay = { currency = "USD,GBP,EUR" }
 paze = { currency = "USD" }
 
 [pm_filters.nexixpay]
-credit = { country = "PL,CZ,RO,SE,CH,HU,US,GB,DK,UA,MK,BG,HR,BA,IS,RS,GI", currency = "PLN,CZK,RON,SEK,CHF,HUF,USD,GBP,DKK,UAH,MKD,BGN,HRK,BAM,ISK,RSD,GIP" }
-debit = { country = "PL,CZ,RO,SE,CH,HU,US,GB,DK,UA,MK,BG,HR,BA,IS,RS,GI", currency = "PLN,CZK,RON,SEK,CHF,HUF,USD,GBP,DKK,UAH,MKD,BGN,HRK,BAM,ISK,RSD,GIP" }
+credit = { country = "AT,BE,CY,EE,FI,FR,DE,GR,IE,IT,LV,LT,LU,MT,NL,PT,SK,SI,ES,BG,HR,DK,GB,NO,PL,CZ,RO,SE,CH,HU", currency = "ARS,AUD,BHD,CAD,CLP,CNY,COP,HRK,CZK,DKK,HKD,HUF,INR,JPY,KZT,JOD,KRW,KWD,MYR,MXN,NGN,NOK,PHP,QAR,RUB,SAR,SGD,VND,ZAR,SEK,CHF,THB,AED,EGP,GBP,USD,TWD,BYN,RSD,AZN,RON,TRY,AOA,BGN,EUR,UAH,PLN,BRL" }
+debit = { country = "AT,BE,CY,EE,FI,FR,DE,GR,IE,IT,LV,LT,LU,MT,NL,PT,SK,SI,ES,BG,HR,DK,GB,NO,PL,CZ,RO,SE,CH,HU", currency = "ARS,AUD,BHD,CAD,CLP,CNY,COP,HRK,CZK,DKK,HKD,HUF,INR,JPY,KZT,JOD,KRW,KWD,MYR,MXN,NGN,NOK,PHP,QAR,RUB,SAR,SGD,VND,ZAR,SEK,CHF,THB,AED,EGP,GBP,USD,TWD,BYN,RSD,AZN,RON,TRY,AOA,BGN,EUR,UAH,PLN,BRL" }
 
 [pm_filters.square]
 credit = { country = "AU,CA,FR,IE,JP,ES,GB,US", currency = "AED,AFN,ALL,AMD,ANG,AOA,ARS,AUD,AWG,AZN,BAM,BBD,BDT,BGN,BHD,BIF,BMD,BND,BOB,BRL,BSD,BTN,BWP,BZD,CAD,CDF,CHF,CLP,CNY,COP,CRC,CUP,CVE,CZK,DJF,DKK,DOP,DZD,EGP,ERN,ETB,EUR,FJD,FKP,GBP,GEL,GHS,GIP,GMD,GNF,GTQ,GYD,HKD,HNL,HRK,HTG,HUF,IDR,ILS,INR,IQD,IRR,ISK,JMD,JOD,JPY,KES,KGS,KHR,KMF,KPW,KRW,KWD,KYD,KZT,LAK,LBP,LKR,LRD,LSL,LYD,MAD,MDL,MGA,MKD,MMK,MNT,MOP,MUR,MVR,MWK,MXN,MYR,MZN,NAD,NGN,NIO,NOK,NPR,NZD,OMR,PAB,PEN,PGK,PHP,PKR,PLN,PYG,QAR,RON,RSD,RUB,RWF,SAR,SBD,SCR,SDG,SEK,SGD,SHP,SLE,SLL,SOS,SRD,SSP,SVC,SYP,SZL,THB,TJS,TMT,TND,TOP,TRY,TTD,TWD,TZS,UAH,UGX,USD,UYU,UZS,VND,VUV,WST,XAF,XCD,XOF,XPF,YER,ZAR,ZMW" }
diff --git a/config/deployments/production.toml b/config/deployments/production.toml
index fc4bca222a9..6d12d8b467a 100644
--- a/config/deployments/production.toml
+++ b/config/deployments/production.toml
@@ -334,8 +334,8 @@ samsung_pay = { currency = "USD,GBP,EUR" }
 paze = { currency = "USD" }
 
 [pm_filters.nexixpay]
-credit = { country = "PL,CZ,RO,SE,CH,HU,US,GB,DK,UA,MK,BG,HR,BA,IS,RS,GI", currency = "PLN,CZK,RON,SEK,CHF,HUF,USD,GBP,DKK,UAH,MKD,BGN,HRK,BAM,ISK,RSD,GIP" }
-debit = { country = "PL,CZ,RO,SE,CH,HU,US,GB,DK,UA,MK,BG,HR,BA,IS,RS,GI", currency = "PLN,CZK,RON,SEK,CHF,HUF,USD,GBP,DKK,UAH,MKD,BGN,HRK,BAM,ISK,RSD,GIP" }
+credit = { country = "AT,BE,CY,EE,FI,FR,DE,GR,IE,IT,LV,LT,LU,MT,NL,PT,SK,SI,ES,BG,HR,DK,GB,NO,PL,CZ,RO,SE,CH,HU", currency = "ARS,AUD,BHD,CAD,CLP,CNY,COP,HRK,CZK,DKK,HKD,HUF,INR,JPY,KZT,JOD,KRW,KWD,MYR,MXN,NGN,NOK,PHP,QAR,RUB,SAR,SGD,VND,ZAR,SEK,CHF,THB,AED,EGP,GBP,USD,TWD,BYN,RSD,AZN,RON,TRY,AOA,BGN,EUR,UAH,PLN,BRL" }
+debit = { country = "AT,BE,CY,EE,FI,FR,DE,GR,IE,IT,LV,LT,LU,MT,NL,PT,SK,SI,ES,BG,HR,DK,GB,NO,PL,CZ,RO,SE,CH,HU", currency = "ARS,AUD,BHD,CAD,CLP,CNY,COP,HRK,CZK,DKK,HKD,HUF,INR,JPY,KZT,JOD,KRW,KWD,MYR,MXN,NGN,NOK,PHP,QAR,RUB,SAR,SGD,VND,ZAR,SEK,CHF,THB,AED,EGP,GBP,USD,TWD,BYN,RSD,AZN,RON,TRY,AOA,BGN,EUR,UAH,PLN,BRL" }
 
 [pm_filters.square]
 credit = { country = "AU,CA,FR,IE,JP,ES,GB,US", currency = "AED,AFN,ALL,AMD,ANG,AOA,ARS,AUD,AWG,AZN,BAM,BBD,BDT,BGN,BHD,BIF,BMD,BND,BOB,BRL,BSD,BTN,BWP,BZD,CAD,CDF,CHF,CLP,CNY,COP,CRC,CUP,CVE,CZK,DJF,DKK,DOP,DZD,EGP,ERN,ETB,EUR,FJD,FKP,GBP,GEL,GHS,GIP,GMD,GNF,GTQ,GYD,HKD,HNL,HRK,HTG,HUF,IDR,ILS,INR,IQD,IRR,ISK,JMD,JOD,JPY,KES,KGS,KHR,KMF,KPW,KRW,KWD,KYD,KZT,LAK,LBP,LKR,LRD,LSL,LYD,MAD,MDL,MGA,MKD,MMK,MNT,MOP,MUR,MVR,MWK,MXN,MYR,MZN,NAD,NGN,NIO,NOK,NPR,NZD,OMR,PAB,PEN,PGK,PHP,PKR,PLN,PYG,QAR,RON,RSD,RUB,RWF,SAR,SBD,SCR,SDG,SEK,SGD,SHP,SLE,SLL,SOS,SRD,SSP,SVC,SYP,SZL,THB,TJS,TMT,TND,TOP,TRY,TTD,TWD,TZS,UAH,UGX,USD,UYU,UZS,VND,VUV,WST,XAF,XCD,XOF,XPF,YER,ZAR,ZMW" }
diff --git a/config/deployments/sandbox.toml b/config/deployments/sandbox.toml
index 37346fc3467..58d298e9c5c 100644
--- a/config/deployments/sandbox.toml
+++ b/config/deployments/sandbox.toml
@@ -336,8 +336,8 @@ samsung_pay = { currency = "USD,GBP,EUR" }
 paze = { currency = "USD" }
 
 [pm_filters.nexixpay]
-credit = { country = "PL,CZ,RO,SE,CH,HU,US,GB,DK,UA,MK,BG,HR,BA,IS,RS,GI", currency = "PLN,CZK,RON,SEK,CHF,HUF,USD,GBP,DKK,UAH,MKD,BGN,HRK,BAM,ISK,RSD,GIP" }
-debit = { country = "PL,CZ,RO,SE,CH,HU,US,GB,DK,UA,MK,BG,HR,BA,IS,RS,GI", currency = "PLN,CZK,RON,SEK,CHF,HUF,USD,GBP,DKK,UAH,MKD,BGN,HRK,BAM,ISK,RSD,GIP" }
+credit = { country = "AT,BE,CY,EE,FI,FR,DE,GR,IE,IT,LV,LT,LU,MT,NL,PT,SK,SI,ES,BG,HR,DK,GB,NO,PL,CZ,RO,SE,CH,HU", currency = "ARS,AUD,BHD,CAD,CLP,CNY,COP,HRK,CZK,DKK,HKD,HUF,INR,JPY,KZT,JOD,KRW,KWD,MYR,MXN,NGN,NOK,PHP,QAR,RUB,SAR,SGD,VND,ZAR,SEK,CHF,THB,AED,EGP,GBP,USD,TWD,BYN,RSD,AZN,RON,TRY,AOA,BGN,EUR,UAH,PLN,BRL" }
+debit = { country = "AT,BE,CY,EE,FI,FR,DE,GR,IE,IT,LV,LT,LU,MT,NL,PT,SK,SI,ES,BG,HR,DK,GB,NO,PL,CZ,RO,SE,CH,HU", currency = "ARS,AUD,BHD,CAD,CLP,CNY,COP,HRK,CZK,DKK,HKD,HUF,INR,JPY,KZT,JOD,KRW,KWD,MYR,MXN,NGN,NOK,PHP,QAR,RUB,SAR,SGD,VND,ZAR,SEK,CHF,THB,AED,EGP,GBP,USD,TWD,BYN,RSD,AZN,RON,TRY,AOA,BGN,EUR,UAH,PLN,BRL" }
 
 [pm_filters.square]
 credit = { country = "AU,CA,FR,IE,JP,ES,GB,US", currency = "AED,AFN,ALL,AMD,ANG,AOA,ARS,AUD,AWG,AZN,BAM,BBD,BDT,BGN,BHD,BIF,BMD,BND,BOB,BRL,BSD,BTN,BWP,BZD,CAD,CDF,CHF,CLP,CNY,COP,CRC,CUP,CVE,CZK,DJF,DKK,DOP,DZD,EGP,ERN,ETB,EUR,FJD,FKP,GBP,GEL,GHS,GIP,GMD,GNF,GTQ,GYD,HKD,HNL,HRK,HTG,HUF,IDR,ILS,INR,IQD,IRR,ISK,JMD,JOD,JPY,KES,KGS,KHR,KMF,KPW,KRW,KWD,KYD,KZT,LAK,LBP,LKR,LRD,LSL,LYD,MAD,MDL,MGA,MKD,MMK,MNT,MOP,MUR,MVR,MWK,MXN,MYR,MZN,NAD,NGN,NIO,NOK,NPR,NZD,OMR,PAB,PEN,PGK,PHP,PKR,PLN,PYG,QAR,RON,RSD,RUB,RWF,SAR,SBD,SCR,SDG,SEK,SGD,SHP,SLE,SLL,SOS,SRD,SSP,SVC,SYP,SZL,THB,TJS,TMT,TND,TOP,TRY,TTD,TWD,TZS,UAH,UGX,USD,UYU,UZS,VND,VUV,WST,XAF,XCD,XOF,XPF,YER,ZAR,ZMW" }
diff --git a/config/development.toml b/config/development.toml
index eab89187a46..1062cdc64f7 100644
--- a/config/development.toml
+++ b/config/development.toml
@@ -553,8 +553,8 @@ samsung_pay = { currency = "USD,GBP,EUR" }
 paze = { currency = "USD" }
 
 [pm_filters.nexixpay]
-credit = { country = "PL,CZ,RO,SE,CH,HU,US,GB,DK,UA,MK,BG,HR,BA,IS,RS,GI", currency = "PLN,CZK,RON,SEK,CHF,HUF,USD,GBP,DKK,UAH,MKD,BGN,HRK,BAM,ISK,RSD,GIP" }
-debit = { country = "PL,CZ,RO,SE,CH,HU,US,GB,DK,UA,MK,BG,HR,BA,IS,RS,GI", currency = "PLN,CZK,RON,SEK,CHF,HUF,USD,GBP,DKK,UAH,MKD,BGN,HRK,BAM,ISK,RSD,GIP" }
+credit = { country = "AT,BE,CY,EE,FI,FR,DE,GR,IE,IT,LV,LT,LU,MT,NL,PT,SK,SI,ES,BG,HR,DK,GB,NO,PL,CZ,RO,SE,CH,HU", currency = "ARS,AUD,BHD,CAD,CLP,CNY,COP,HRK,CZK,DKK,HKD,HUF,INR,JPY,KZT,JOD,KRW,KWD,MYR,MXN,NGN,NOK,PHP,QAR,RUB,SAR,SGD,VND,ZAR,SEK,CHF,THB,AED,EGP,GBP,USD,TWD,BYN,RSD,AZN,RON,TRY,AOA,BGN,EUR,UAH,PLN,BRL" }
+debit = { country = "AT,BE,CY,EE,FI,FR,DE,GR,IE,IT,LV,LT,LU,MT,NL,PT,SK,SI,ES,BG,HR,DK,GB,NO,PL,CZ,RO,SE,CH,HU", currency = "ARS,AUD,BHD,CAD,CLP,CNY,COP,HRK,CZK,DKK,HKD,HUF,INR,JPY,KZT,JOD,KRW,KWD,MYR,MXN,NGN,NOK,PHP,QAR,RUB,SAR,SGD,VND,ZAR,SEK,CHF,THB,AED,EGP,GBP,USD,TWD,BYN,RSD,AZN,RON,TRY,AOA,BGN,EUR,UAH,PLN,BRL" }
 
 [pm_filters.square]
 credit = { country = "AU,CA,FR,IE,JP,ES,GB,US", currency = "AED,AFN,ALL,AMD,ANG,AOA,ARS,AUD,AWG,AZN,BAM,BBD,BDT,BGN,BHD,BIF,BMD,BND,BOB,BRL,BSD,BTN,BWP,BZD,CAD,CDF,CHF,CLP,CNY,COP,CRC,CUP,CVE,CZK,DJF,DKK,DOP,DZD,EGP,ERN,ETB,EUR,FJD,FKP,GBP,GEL,GHS,GIP,GMD,GNF,GTQ,GYD,HKD,HNL,HRK,HTG,HUF,IDR,ILS,INR,IQD,IRR,ISK,JMD,JOD,JPY,KES,KGS,KHR,KMF,KPW,KRW,KWD,KYD,KZT,LAK,LBP,LKR,LRD,LSL,LYD,MAD,MDL,MGA,MKD,MMK,MNT,MOP,MUR,MVR,MWK,MXN,MYR,MZN,NAD,NGN,NIO,NOK,NPR,NZD,OMR,PAB,PEN,PGK,PHP,PKR,PLN,PYG,QAR,RON,RSD,RUB,RWF,SAR,SBD,SCR,SDG,SEK,SGD,SHP,SLE,SLL,SOS,SRD,SSP,SVC,SYP,SZL,THB,TJS,TMT,TND,TOP,TRY,TTD,TWD,TZS,UAH,UGX,USD,UYU,UZS,VND,VUV,WST,XAF,XCD,XOF,XPF,YER,ZAR,ZMW" }
diff --git a/config/docker_compose.toml b/config/docker_compose.toml
index 9a24adcd5e9..1cc35e9b799 100644
--- a/config/docker_compose.toml
+++ b/config/docker_compose.toml
@@ -526,8 +526,8 @@ samsung_pay = { currency = "USD,GBP,EUR" }
 paze = { currency = "USD" }
 
 [pm_filters.nexixpay]
-credit = { country = "PL,CZ,RO,SE,CH,HU,US,GB,DK,UA,MK,BG,HR,BA,IS,RS,GI", currency = "PLN,CZK,RON,SEK,CHF,HUF,USD,GBP,DKK,UAH,MKD,BGN,HRK,BAM,ISK,RSD,GIP" }
-debit = { country = "PL,CZ,RO,SE,CH,HU,US,GB,DK,UA,MK,BG,HR,BA,IS,RS,GI", currency = "PLN,CZK,RON,SEK,CHF,HUF,USD,GBP,DKK,UAH,MKD,BGN,HRK,BAM,ISK,RSD,GIP" }
+credit = { country = "AT,BE,CY,EE,FI,FR,DE,GR,IE,IT,LV,LT,LU,MT,NL,PT,SK,SI,ES,BG,HR,DK,GB,NO,PL,CZ,RO,SE,CH,HU", currency = "ARS,AUD,BHD,CAD,CLP,CNY,COP,HRK,CZK,DKK,HKD,HUF,INR,JPY,KZT,JOD,KRW,KWD,MYR,MXN,NGN,NOK,PHP,QAR,RUB,SAR,SGD,VND,ZAR,SEK,CHF,THB,AED,EGP,GBP,USD,TWD,BYN,RSD,AZN,RON,TRY,AOA,BGN,EUR,UAH,PLN,BRL" }
+debit = { country = "AT,BE,CY,EE,FI,FR,DE,GR,IE,IT,LV,LT,LU,MT,NL,PT,SK,SI,ES,BG,HR,DK,GB,NO,PL,CZ,RO,SE,CH,HU", currency = "ARS,AUD,BHD,CAD,CLP,CNY,COP,HRK,CZK,DKK,HKD,HUF,INR,JPY,KZT,JOD,KRW,KWD,MYR,MXN,NGN,NOK,PHP,QAR,RUB,SAR,SGD,VND,ZAR,SEK,CHF,THB,AED,EGP,GBP,USD,TWD,BYN,RSD,AZN,RON,TRY,AOA,BGN,EUR,UAH,PLN,BRL" }
 
 [pm_filters.square]
 credit = { country = "AU,CA,FR,IE,JP,ES,GB,US", currency = "AED,AFN,ALL,AMD,ANG,AOA,ARS,AUD,AWG,AZN,BAM,BBD,BDT,BGN,BHD,BIF,BMD,BND,BOB,BRL,BSD,BTN,BWP,BZD,CAD,CDF,CHF,CLP,CNY,COP,CRC,CUP,CVE,CZK,DJF,DKK,DOP,DZD,EGP,ERN,ETB,EUR,FJD,FKP,GBP,GEL,GHS,GIP,GMD,GNF,GTQ,GYD,HKD,HNL,HRK,HTG,HUF,IDR,ILS,INR,IQD,IRR,ISK,JMD,JOD,JPY,KES,KGS,KHR,KMF,KPW,KRW,KWD,KYD,KZT,LAK,LBP,LKR,LRD,LSL,LYD,MAD,MDL,MGA,MKD,MMK,MNT,MOP,MUR,MVR,MWK,MXN,MYR,MZN,NAD,NGN,NIO,NOK,NPR,NZD,OMR,PAB,PEN,PGK,PHP,PKR,PLN,PYG,QAR,RON,RSD,RUB,RWF,SAR,SBD,SCR,SDG,SEK,SGD,SHP,SLE,SLL,SOS,SRD,SSP,SVC,SYP,SZL,THB,TJS,TMT,TND,TOP,TRY,TTD,TWD,TZS,UAH,UGX,USD,UYU,UZS,VND,VUV,WST,XAF,XCD,XOF,XPF,YER,ZAR,ZMW" }
diff --git a/crates/hyperswitch_connectors/src/connectors/nexixpay/transformers.rs b/crates/hyperswitch_connectors/src/connectors/nexixpay/transformers.rs
index fd504a7a412..27eebf78dfb 100644
--- a/crates/hyperswitch_connectors/src/connectors/nexixpay/transformers.rs
+++ b/crates/hyperswitch_connectors/src/connectors/nexixpay/transformers.rs
@@ -158,18 +158,18 @@ pub struct Order {
 #[serde(rename_all = "camelCase")]
 pub struct CustomerInfo {
     card_holder_name: Secret<String>,
-    billing_address: BillingAddress,
+    billing_address: Option<BillingAddress>,
     shipping_address: Option<ShippingAddress>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct BillingAddress {
-    name: Secret<String>,
-    street: Secret<String>,
-    city: String,
-    post_code: Secret<String>,
-    country: enums::CountryAlpha2,
+    name: Option<Secret<String>>,
+    street: Option<Secret<String>>,
+    city: Option<String>,
+    post_code: Option<Secret<String>>,
+    country: Option<enums::CountryAlpha2>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -445,19 +445,29 @@ impl TryFrom<&NexixpayRouterData<&PaymentsAuthorizeRouterData>> for NexixpayPaym
     fn try_from(
         item: &NexixpayRouterData<&PaymentsAuthorizeRouterData>,
     ) -> Result<Self, Self::Error> {
-        let billing_address_street = format!(
-            "{}, {}",
-            item.router_data.get_billing_line1()?.expose(),
-            item.router_data.get_billing_line2()?.expose()
-        );
-
-        let billing_address = BillingAddress {
-            name: item.router_data.get_billing_full_name()?,
-            street: Secret::new(billing_address_street),
-            city: item.router_data.get_billing_city()?,
-            post_code: item.router_data.get_billing_zip()?,
-            country: item.router_data.get_billing_country()?,
+        let billing_address_street = match (
+            item.router_data.get_optional_billing_line1(),
+            item.router_data.get_optional_billing_line2(),
+        ) {
+            (Some(line1), Some(line2)) => Some(Secret::new(format!(
+                "{}, {}",
+                line1.expose(),
+                line2.expose()
+            ))),
+            (Some(line1), None) => Some(line1),
+            (None, Some(line2)) => Some(line2),
+            (None, None) => None,
         };
+        let billing_address = item
+            .router_data
+            .get_optional_billing()
+            .map(|_| BillingAddress {
+                name: item.router_data.get_optional_billing_full_name(),
+                street: billing_address_street,
+                city: item.router_data.get_optional_billing_city(),
+                post_code: item.router_data.get_optional_billing_zip(),
+                country: item.router_data.get_optional_billing_country(),
+            });
         let shipping_address_street = match (
             item.router_data.get_optional_shipping_line1(),
             item.router_data.get_optional_shipping_line2(),
@@ -474,7 +484,7 @@ impl TryFrom<&NexixpayRouterData<&PaymentsAuthorizeRouterData>> for NexixpayPaym
 
         let shipping_address = item
             .router_data
-            .get_optional_billing()
+            .get_optional_shipping()
             .map(|_| ShippingAddress {
                 name: item.router_data.get_optional_shipping_full_name(),
                 street: shipping_address_street,
@@ -995,19 +1005,29 @@ impl TryFrom<&NexixpayRouterData<&PaymentsCompleteAuthorizeRouterData>>
 
         let order_id = item.router_data.connector_request_reference_id.clone();
         let amount = item.amount.clone();
-        let billing_address_street = format!(
-            "{}, {}",
-            item.router_data.get_billing_line1()?.expose(),
-            item.router_data.get_billing_line2()?.expose()
-        );
-
-        let billing_address = BillingAddress {
-            name: item.router_data.get_billing_full_name()?,
-            street: Secret::new(billing_address_street),
-            city: item.router_data.get_billing_city()?,
-            post_code: item.router_data.get_billing_zip()?,
-            country: item.router_data.get_billing_country()?,
+        let billing_address_street = match (
+            item.router_data.get_optional_billing_line1(),
+            item.router_data.get_optional_billing_line2(),
+        ) {
+            (Some(line1), Some(line2)) => Some(Secret::new(format!(
+                "{}, {}",
+                line1.expose(),
+                line2.expose()
+            ))),
+            (Some(line1), None) => Some(line1),
+            (None, Some(line2)) => Some(line2),
+            (None, None) => None,
         };
+        let billing_address = item
+            .router_data
+            .get_optional_billing()
+            .map(|_| BillingAddress {
+                name: item.router_data.get_optional_billing_full_name(),
+                street: billing_address_street,
+                city: item.router_data.get_optional_billing_city(),
+                post_code: item.router_data.get_optional_billing_zip(),
+                country: item.router_data.get_optional_billing_country(),
+            });
         let shipping_address_street = match (
             item.router_data.get_optional_shipping_line1(),
             item.router_data.get_optional_shipping_line2(),
@@ -1024,7 +1044,7 @@ impl TryFrom<&NexixpayRouterData<&PaymentsCompleteAuthorizeRouterData>>
 
         let shipping_address = item
             .router_data
-            .get_optional_billing()
+            .get_optional_shipping()
             .map(|_| ShippingAddress {
                 name: item.router_data.get_optional_shipping_full_name(),
                 street: shipping_address_street,
diff --git a/crates/router/src/configs/defaults/payment_connector_required_fields.rs b/crates/router/src/configs/defaults/payment_connector_required_fields.rs
index 3849054045c..f31ea0c9d80 100644
--- a/crates/router/src/configs/defaults/payment_connector_required_fields.rs
+++ b/crates/router/src/configs/defaults/payment_connector_required_fields.rs
@@ -2239,42 +2239,6 @@ impl Default for settings::RequiredFields {
                                                     value: None,
                                                 }
                                             ),
-                                            (
-                                                "billing.address.line1".to_string(),
-                                                RequiredFieldInfo {
-                                                    required_field: "payment_method_data.billing.address.line1".to_string(),
-                                                    display_name: "line1".to_string(),
-                                                    field_type: enums::FieldType::UserAddressLine1,
-                                                    value: None,
-                                                }
-                                            ),
-                                            (
-                                                "billing.address.line2".to_string(),
-                                                RequiredFieldInfo {
-                                                    required_field: "payment_method_data.billing.address.line2".to_string(),
-                                                    display_name: "line1".to_string(),
-                                                    field_type: enums::FieldType::UserAddressLine2,
-                                                    value: None,
-                                                }
-                                            ),
-                                            (
-                                                "billing.address.city".to_string(),
-                                                RequiredFieldInfo {
-                                                    required_field: "payment_method_data.billing.address.city".to_string(),
-                                                    display_name: "city".to_string(),
-                                                    field_type: enums::FieldType::UserAddressCity,
-                                                    value: None,
-                                                }
-                                            ),
-                                            (
-                                                "billing.address.zip".to_string(),
-                                                RequiredFieldInfo {
-                                                    required_field: "payment_method_data.billing.address.zip".to_string(),
-                                                    display_name: "zip".to_string(),
-                                                    field_type: enums::FieldType::UserAddressPincode,
-                                                    value: None,
-                                                }
-                                            ),
                                             (
                                                 "billing.address.first_name".to_string(),
                                                 RequiredFieldInfo {
@@ -5746,42 +5710,6 @@ impl Default for settings::RequiredFields {
                                                     value: None,
                                                 }
                                             ),
-                                            (
-                                                "billing.address.line1".to_string(),
-                                                RequiredFieldInfo {
-                                                    required_field: "payment_method_data.billing.address.line1".to_string(),
-                                                    display_name: "line1".to_string(),
-                                                    field_type: enums::FieldType::UserAddressLine1,
-                                                    value: None,
-                                                }
-                                            ),
-                                            (
-                                                "billing.address.line2".to_string(),
-                                                RequiredFieldInfo {
-                                                    required_field: "payment_method_data.billing.address.line2".to_string(),
-                                                    display_name: "line1".to_string(),
-                                                    field_type: enums::FieldType::UserAddressLine2,
-                                                    value: None,
-                                                }
-                                            ),
-                                            (
-                                                "billing.address.city".to_string(),
-                                                RequiredFieldInfo {
-                                                    required_field: "payment_method_data.billing.address.city".to_string(),
-                                                    display_name: "city".to_string(),
-                                                    field_type: enums::FieldType::UserAddressCity,
-                                                    value: None,
-                                                }
-                                            ),
-                                            (
-                                                "billing.address.zip".to_string(),
-                                                RequiredFieldInfo {
-                                                    required_field: "payment_method_data.billing.address.zip".to_string(),
-                                                    display_name: "zip".to_string(),
-                                                    field_type: enums::FieldType::UserAddressPincode,
-                                                    value: None,
-                                                }
-                                            ),
                                             (
                                                 "billing.address.first_name".to_string(),
                                                 RequiredFieldInfo {
diff --git a/loadtest/config/development.toml b/loadtest/config/development.toml
index bdf46a8ee40..dc7a310b6b8 100644
--- a/loadtest/config/development.toml
+++ b/loadtest/config/development.toml
@@ -310,8 +310,8 @@ credit = { country = "US,CA", currency = "USD" }
 debit = { country = "US,CA", currency = "USD" }
 
 [pm_filters.nexixpay]
-credit = { country = "PL,CZ,RO,SE,CH,HU,US,GB,DK,UA,MK,BG,HR,BA,IS,RS,GI", currency = "PLN,CZK,RON,SEK,CHF,HUF,USD,GBP,DKK,UAH,MKD,BGN,HRK,BAM,ISK,RSD,GIP" }
-debit = { country = "PL,CZ,RO,SE,CH,HU,US,GB,DK,UA,MK,BG,HR,BA,IS,RS,GI", currency = "PLN,CZK,RON,SEK,CHF,HUF,USD,GBP,DKK,UAH,MKD,BGN,HRK,BAM,ISK,RSD,GIP" }
+credit = { country = "AT,BE,CY,EE,FI,FR,DE,GR,IE,IT,LV,LT,LU,MT,NL,PT,SK,SI,ES,BG,HR,DK,GB,NO,PL,CZ,RO,SE,CH,HU", currency = "ARS,AUD,BHD,CAD,CLP,CNY,COP,HRK,CZK,DKK,HKD,HUF,INR,JPY,KZT,JOD,KRW,KWD,MYR,MXN,NGN,NOK,PHP,QAR,RUB,SAR,SGD,VND,ZAR,SEK,CHF,THB,AED,EGP,GBP,USD,TWD,BYN,RSD,AZN,RON,TRY,AOA,BGN,EUR,UAH,PLN,BRL" }
+debit = { country = "AT,BE,CY,EE,FI,FR,DE,GR,IE,IT,LV,LT,LU,MT,NL,PT,SK,SI,ES,BG,HR,DK,GB,NO,PL,CZ,RO,SE,CH,HU", currency = "ARS,AUD,BHD,CAD,CLP,CNY,COP,HRK,CZK,DKK,HKD,HUF,INR,JPY,KZT,JOD,KRW,KWD,MYR,MXN,NGN,NOK,PHP,QAR,RUB,SAR,SGD,VND,ZAR,SEK,CHF,THB,AED,EGP,GBP,USD,TWD,BYN,RSD,AZN,RON,TRY,AOA,BGN,EUR,UAH,PLN,BRL" }
 
 [pm_filters.square]
 credit = { country = "AU,CA,FR,IE,JP,ES,GB,US", currency = "AED,AFN,ALL,AMD,ANG,AOA,ARS,AUD,AWG,AZN,BAM,BBD,BDT,BGN,BHD,BIF,BMD,BND,BOB,BRL,BSD,BTN,BWP,BZD,CAD,CDF,CHF,CLP,CNY,COP,CRC,CUP,CVE,CZK,DJF,DKK,DOP,DZD,EGP,ERN,ETB,EUR,FJD,FKP,GBP,GEL,GHS,GIP,GMD,GNF,GTQ,GYD,HKD,HNL,HRK,HTG,HUF,IDR,ILS,INR,IQD,IRR,ISK,JMD,JOD,JPY,KES,KGS,KHR,KMF,KPW,KRW,KWD,KYD,KZT,LAK,LBP,LKR,LRD,LSL,LYD,MAD,MDL,MGA,MKD,MMK,MNT,MOP,MUR,MVR,MWK,MXN,MYR,MZN,NAD,NGN,NIO,NOK,NPR,NZD,OMR,PAB,PEN,PGK,PHP,PKR,PLN,PYG,QAR,RON,RSD,RUB,RWF,SAR,SBD,SCR,SDG,SEK,SGD,SHP,SLE,SLL,SOS,SRD,SSP,SVC,SYP,SZL,THB,TJS,TMT,TND,TOP,TRY,TTD,TWD,TZS,UAH,UGX,USD,UYU,UZS,VND,VUV,WST,XAF,XCD,XOF,XPF,YER,ZAR,ZMW" }