I am currently developing a mobile marketplace application using React-Native and Nest.js. I am implementing the 'onboarding before payment' flow for sellers, where I am storing the merchant id in my database. However, when a customer adds a payment method and I use the "v3/vault/setup-tokens" and "v3/vault/payment-tokens" to retrieve the vault_id, and then create an order using "v2/checkout/orders", I always receive a 422 response with the message "Payee account specified is invalid. Please check the payee.email_address' or payee.merchant_id' specified and try again. Ensure that either payee.merchant_idor `payee.email_address" is specified." I have followed the steps outlined in the PayPal documentation but am still encountering this issue. I would like to know if anyone has any experience with this issue and could provide guidance on how to solve it. I am also looking to integrate PayPal and credit card payments in my application and any suggestions on how to do this with React-Native and Nest.js would be greatly appreciated.
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