We are building one e-commerce project with multiple targets(apps), my question is can we use one merchant id for all of our apps?

CodePudding user response：

To enable your app to use Apple Pay, register an identifier with Apple that uniquely identifies your business as a merchant able to accept payments. This ID never expires, and can be used in multiple websites and apps.

See https://developer.apple.com/documentation/passkit/apple_pay/setting_up_apple_pay