Sg_paynow_bank MISSING_PAYMENT_METHOD_REQUIRED_FIELD - [CUSTOMER]

Hi,

when i post:
{“amount”: “125.00”,
“currency”: “SGD”,
“payment_method”: {
“type”: “sg_paynow_bank”}}
to https://sandboxapi.rapyd.net/v1/payments i get back following error code:
“error_code”:“MISSING_PAYMENT_METHOD_REQUIRED_FIELD - [CUSTOMER]”

Can someone advise?