iOS payment token to a merchant server, which passes it through a network API to a payment processor, which uses it to create an authorization request that it forwards to the acquiring bank. Alternatively, the merchant app may use an SDK supplied by the processor, which sends the iOS payment...
With this you can use Liquid markup's 'case' and 'when' statements to trigger off the value of {{footer}} to change the HTML used in the email template to match what you want for each of your brands. After much trial and error testing of my own, here is the outline to follow to...