post https://api.sandbox.joinforage.app/api/payment_methods/
This endpoint will return a tokenized payment method. The PaymentMethod object will be stripped of sensitive cardholder data. Use the object's ref to reference the payment instrument. You will need to store the ref on your platform and map it to the customer's account.
Refs are useful because they allow you to avoid storing or transmitting sensitive cardholder data on your own servers.