Question: I need the functions add a new payment method , update payment method and delete payment method and choose which payment method the user wants

I need the functions add a new payment method , update payment method and delete payment method and choose which payment method the user wants , i think the returning Void is wrong so i need help to change it

Payment CreditCard String Coupon String -Cash: float Add (: Void Updatel rvoid Delete()void ChosePayment()

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