Regarding Adding payment in square API

1)I am trying to add payment through square api POST /v2/payments

in that its asking for source_id , where or how i can find that source_id,

2)can u suggest how can i add payments in my test account for testing purpose

  1. source_id will either be a nonce that is generated via the Square Payment Form, or a customer_card_id from a customer’s saved card on file. I would suggest taking a look at the Overview for more information.
  2. We have Sandbox Test Values that you can use

Thanks…for the clarification