Release testing instructions for WC Payments 9.1.0

fix: Manual capture fails in the transaction detail screen with a customized order number

PR https://github.com/Automattic/woocommerce-payments/pull/10435

1. Install and activate a sequential order number plugin (like Sequential Order Numbers for WooCommerce or Sequential Order Numbers Pro for WooCommerce, which can be downloaded from here by any Automattic staff)
2. Create a new order with a payment that requires manual capture
3. Try to capture the payment from the transaction detail screen
4. Verify that the capture succeeds and no errors occur
5. Verify that order and subscription numbers are displayed correctly in the transactions list

Fix: Update Safe Mode notice to be consistent with new changes from Jetpack #10511

PR https://github.com/Automattic/woocommerce-payments/pull/10511

• Install this plugin https://jetpack.com/download-jetpack-beta/, then activate jetpack-debug-helper, then Identity Crisis Simulation Utility.
• Trigger between two types of notices, use this constant in wp-config.php, and change its value to either development or production: define( 'WP_ENVIRONMENT_TYPE', 'development' );
• Expect: see two different notices.
• Expect: in the two notices, all text contents and links are WooPayments-relevant.

Fix: Using 3DS cards for changing payment method for subscription use-case

PR: https://github.com/Automattic/woocommerce-payments/pull/10453 (feel free to ping @timur on Slack if any questions)

• Purchase a subscription with a normal non-3DS card
• Navigate to change payment method flow and change payment method to a 3DS 4000002760003184 with the following use-cases
  • Upon authorization, cancel the modal window from the top right side and confirm
    • The We are unable to authenticate your payment method. Please choose a different payment method and try again error on the page
    • Subscription has the old payment method still attached
  • Click on "Change payment method" once again, this time fail the authorization and confirm that
    • We are unable to authenticate your payment method. Please choose a different payment method and try again. notice is visible
    • Subscription has the old payment method still attached
  • Uncheck the Use this payment method for all of my current subscriptions checkbox and confirm the authorization
    • Once the confirmation modal pops up, confirm there is no success notice displayed behind the pop-up window since we're still in the process of confirming the payment for 3DS
    • Confirm that you are redirected to the subscription details page under my account
    • Confirm tha the successful Payment method updated. notice is displayed
  • Check the Use this payment method for all of my current subscriptions checkbox and confirm the authorization
    • Confirm that you are redirected to the subscription details page under my account
    • Confirm that the successful Payment method updated for all your current subscriptions. notice is displayed
    • Confirm that all the subscriptions were updated with the new payment method
• Change payment method to a new non-3DS card
• Change payment method to a saved card (both 3DS and non-3DS)
• Use the insufficient funds 3DS card 4000000000009995 and confirm the card is not attached to the subscription after failure, and the correct error notice for insufficient funds is being displayed
• Process renewal for a subscription that has a 3DS card attached to it as a result of a change payment method flow
  • Upon renewal processing attempt, the order should be expectedly put On hold and once you navigate to the link in the renewal order email sent to the shopper, you should be able to successfully renew order with a 3DS card
  • Perform the same test, but change to a non-3DS card during renewal order