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Can I change my API key and secret?
I got an error USER_STATE_IS_NOT_ACTIVE when I performed an Increase Capture.What is the cause of this error?
Where can I find MERCHANT_ID, API_KEY, and API_SECRET in "PayPay for Developers" to use in building the SDK?
Is it possible to set query parameters in the redirect URL?
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What value should I set for the value of currency parameter?
Can the Merchant Order ID (merchantPaymentId) be duplicated?
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What are the cases of payment failure?
Tell me when deduction is conducted from users PayPay balance in the case of PreAuth & Capture.

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Can It use the same merchantPaymentId multiple times?

January 19, 2022 16:45

No, the same merchantPaymentId cannot be used.

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