curl --request GET \
  --url https://api.piriod.com/sources/ \
  --header 'Authorization: <api-key>' \
  --header 'x-simple-workspace: <x-simple-workspace>'

{
  "count": 142,
  "results": [
    {
      "gateway": "<string>",
      "id": 123,
      "customer": "<string>",
      "usage": "single",
      "amount": 123,
      "description": "<string>",
      "return_url": "<string>",
      "gateway_data": {},
      "client": {},
      "metadata": {},
      "card": {
        "brand": "<string>",
        "last4": "<string>",
        "exp_month": 123,
        "exp_year": 123
      },
      "test_mode": true,
      "created": "2023-11-07T05:31:56Z",
      "updated": "2023-11-07T05:31:56Z"
    }
  ],
  "next": "<string>",
  "previous": "<string>"
}