Regarding Adding payment in square API

Questions
1

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

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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

2
  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
3

Thanks…for the clarification