Issue:
[BUG] : [Adyen] Production URL endpoint

### Bug Description

For Adyen production URL endpoint is not correctly configured as compared to how it is used

### Expected Behavior

`/` is missing in the end for production endpoint

### Actual Behavior

For Adyen production URL endpoint is not correctly configured as compared to how it is used

### Steps To Reproduce

Provide an unambiguous set of steps to reproduce this bug. Include code or configuration to reproduce, if relevant.
1. Go to '...'
2. Click on '....'
3. Scroll down to '....'


### Context For The Bug

_No response_

### Environment

Are you using hyperswitch hosted version? Yes/No
If yes, please provide the value of the `x-request-id` response header to help us debug your issue.

If not (or if building/running locally), please provide the following details:
1. Operating System or Linux distribution:
2. Rust version (output of `rustc --version`): ``
3. App version (output of `cargo r --features vergen -- --version`): ``


### Have you spent some time checking if this bug has been raised before?

- [X] I checked and didn't find a similar issue

### Have you read the Contributing Guidelines?

- [X] I have read the [Contributing Guidelines](https://github.com/juspay/hyperswitch/blob/main/docs/CONTRIBUTING.md)

### Are you willing to submit a PR?

Yes, I am willing to submit a PR!

Resolution:
<think>
PR Context:
- Title: fix(connector): [Adyen] update config and add required fields
- Merged: 2024-03-12T13:58:19Z
- Files changed: 3 files
- Commits: 2 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [X] Bugfix
- [ ] New feature
- [X] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->

- Update Prod URL endpoint
- Handle refunds webhooks using hyperswitch internal refund id
- Add card holder name

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [X] This P
</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** fix(connector): [Adyen] update config and add required fields (#4046)
Files to modify:


**crates/router/src/connector/adyen.rs**
  Modify existing code

**crates/router/src/connector/adyen/transformers.rs**
  Modify existing code

**Commit 2:** fix(connector): [Adyen] update config and add required fields (#4046)
Files to modify:


**crates/router/src/connector/adyen.rs**
  Modify existing code

**crates/router/src/connector/adyen/transformers.rs**
  Modify existing code