1. PayPay for Developers FAQ
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  3. What happens if you make payment multiple times with the same merchantPaymentId?

PayPay for Developers FAQ

What happens if you make payment multiple times with the same merchantPaymentId?

For the 1st payment request, the payment is completed. For the 2nd payment request, the result of the 1st payment request is returned.
That is, if you send a payment request again, you need to change mercharntPaymentId.

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