how can i make my payment method with momo on iphone 7plus
i want to make payments with momo on my payment method
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I am not familiar with MoMo, however with one exception it is not included on Apple's list Payment methods that you can use with your Apple ID - Apple Support. The exception is for customers in Vietnam. If you are elsewhere this is not listed as an option.
With regard to setting a payment method, see the support document Add a payment method to your Apple ID - Apple Support.