How to change the email address for receipt/reminder/confirmation message.

iPhone, iPad

1. Add the email account in iPhone/iPad's setting
   https://support.apple.com/HT201320
   
   
2. On the receipt/reminder/confirmation message composing screen, tap "Cc/Bcc, From" > "From" to select the account added in step 1.
   https://www.iphonefaq.org/archives/974193
   
   You can use any email address with above steps.
   
   

Android

1. Add Google account in Device's Setting > Accounts (Or Users & Accounts) > Add Account > Google
   
   
2. In the App's setting > E-Mail > Allow to access to gmail account > Select one of the google account you want to send message from.
   
   
   To use non gmail.com address, you'll need to register your email address as G Suite, then your own email address will be appeared in the selection in the step2 above.
   https://gsuite.google.com/products/gmail/