Remember that before creating a PayIn/PayOut request, you can verify each bank account number through our "Bank Account Validation" service.
However, when using the bank account validation service, you will need not only the bank account number, but also the name of the bank to which the account belongs. Each bank has a unique "bank code" assigned by LP that you will have to add in the request.
Check if a bank account is valid through the LP's Api: