Question: Where was the Apple store coupon and credit card feature announced, that came with the eighth major iOS mobile update?

Context paragraphs:
SnipSnap: SnipSnap is a mobile coupon app founded in Philadelphia that allows users to take a photograph of a printed coupon in order to find or create a mobile coupon, which can be redeemed in store.  The app scans the text, images, logos, and barcodes within the coupon photograph in order to parse out all of the structured coupon content dynamically.  The app uses some of this information to power features such as expiration-date reminders, location-based notifications (utilizing the store name, as well as the location of the phone), and scanable barcodes.  The app is currently available for iOS (iPhone and iPod Touch only) and Android devices.

Postal address verification: Postal address verification (also known as address standardization, address validation, address verification and CASS certification) is the process used to check the validity and deliverability of a physical mailing address.  According to the United States Postal Service, an address is valid (or mailable) if it is CASS-certified, meaning that it exists within the comprehensive list of mailable addresses in their Address Management System.  This is different from the credit card Address Verification System (AVS), which is the method used by credit card processors to authenticate ownership of a credit card by verifying that the account on the credit card matches the billing address on file.  Credit card AVS does not determine deliverability of an address.

Credit card: A credit card is a payment card issued to users (cardholders) to enable the cardholder to pay a merchant for goods and services, based on the cardholder's promise to the card issuer to pay them for the amounts so paid plus other agreed charges.  The card issuer (usually a bank) creates a revolving account and grants a line of credit to the cardholder, from which the cardholder can borrow money for payment to a merchant or as a cash advance.  In other words, credit cards combine payment services with extensions of credit.  Complex fee structures in the credit card industry may limit customers' ability to comparison shop, help ensure that the industry is not price-competitive and help maximize industry profits.  Because of this, legislatures have regulated credit card fees.

Apple Wallet: Apple Wallet (Wallet for short, formerly Passbook) is a mobile app included with the iOS operating system that allows users to store coupons, boarding passes, event tickets, store cards and (starting with iOS 8.1) credit cards, loyalty cards, and debit cards via Apple Pay.  It was designed by Apple Inc. and was presented at the 2012 Apple Worldwide Developers Conference (WWDC) on June 11, 2012.  The app first appeared on iOS 6 on September 19, 2012.

IOS 8: iOS 8 is the eighth major release of the iOS mobile operating system developed by Apple Inc., being the successor to iOS 7.  It was announced at the company's Worldwide Developers Conference on June 2, 2014, and was released on September 17, 2014.  It was succeeded by iOS 9 on September 16, 2015.

IOS 11: iOS 11 is the current eleventh major release of the iOS mobile operating system developed by Apple Inc., being the successor to iOS 10.  It was announced and the first beta version released to developers at the company's Worldwide Developers Conference on June 5, 2017, with a public beta released in late June, and a stable version for consumers was released in most countries on September 19, 2017.  Some countries got the update on September 20, 2017.

Bankcard: Bankcard was a shared-brand credit card issued by financial institutions in Australia and New Zealand between 1974 and 2006.  It was managed by the Bankcard Association of Australia, a joint venture of Australia's largest banks, and was the nation's first mass-market credit card.  Before 1974, only store cards, Diners Club and American Express were available in Australia and these were either restrictive or only accessible to the wealthy.  In the first decade after its introduction, Bankcard dominated the Australian credit card market, with more than 5 million cardholders at its peak in 1984.  As a result of a declining cardholder base, falling transaction volumes and shrinking market share in relation to internationally accepted credit cards such as Visa and MasterCard, the card was withdrawn from use in 2006.

Interchange Plus: Interchange Plus is the common name for a pricing structure for accepting credit card transactions by merchants.  The Interchange fee is an important factor in determining the actual cost of accepting credit cards.  Interchange pricing is what the Visa and MasterCard associations along with credit card issuing banks charge merchant account providers to process credit and debit card transactions.  Merchant Account providers then charge a markup on interchange known as interchange plus pricing to process the transaction and provide customer service to the merchant accepting the credit or debit card payment.  Interchange Plus pricing is known as the most honest and transparent form of pricing for merchants looking to accept credit cards.  There are a lot of credit card processing companies that only offer interchange plus pricing.

Credit card fraud: Credit card fraud is a wide-ranging term for theft and fraud committed using or involving a payment card, such as a credit card or debit card, as a fraudulent source of funds in a transaction.  The purpose may be to obtain goods without paying, or to obtain unauthorized funds from an account.  Credit card fraud is also an adjunct to identity theft.  According to the United States Federal Trade Commission, while the rate of identity theft had been holding steady during the mid 2000s, it increased by 21 percent in 2008.  However, credit card fraud, that crime which most people associate with ID theft, decreased as a percentage of all ID theft complaints for the sixth year in a row.

Credit card hijacking: Credit card hijacking is a form of credit card fraud and the term is used when a person’s credit card is used by some unauthorized person (e.g. a thief or overaggressive vendor) to buy goods or services.  The credit card owner usually has trouble reasserting control over the card, because usually they don't find out immediately, and the owner must distinguish legitimate purchases from illegitimate in a credible manner.

Supporting paragraphs: Apple Wallet IOS 8
Answer: 2012 Apple Worldwide Developers Conference