Sandbox Send Parcel API Error

Hi,

My account is andrew@amzfit.com, and I tried Send Parcel API, but got error. First I call get rate API and get rate id, then call

POST https://sandbox.deftship.com/api/parcel-orders/ship

Request Body:

{"rate_id":"1936665859"}

Response Body:

{"success":false,"message":"It is required to have a saved credit card to be able to send shipments"}

Please advise. Thanks.

Regards,

Max