#3988656 composite-checkout: Add WeChat Pay

Changes proposed in this Pull Request

This adds the “WeChat Pay” payment method to composite-checkout.

Screenshots

Old checkout:

New checkout:

Testing instructions

• Apply D45650-code to force WeChat Pay to be available.
• Sandbox the store.
• Add a plan to your cart and visit checkout.
• Add ?flags=composite-checkout-force to the query string in the URL and reload the page because currently it is disabled for international currencies.
• Verify that “WeChat Pay” is an option displayed in the final payment step.
• Verify that you cannot pay if the “Name” field is empty.
• Fill out the “Name” field and submit the payment.
• Verify that you see a QR code appear and it is scrolled into view.
• In a new window or tab open the link at the bottom that reads “To open and pay with the wechat pay app directly, click here”.
• In the new window, you should see a Stripe test page.
• Click to accept the payment and verify that the payment completes successfully in the original window and that the plan is purchased.