curl --request POST \
  --url https://api.loops.fi/api/v1/checkout/sessions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "paymentLinkId": "<string>",
  "externalCustomerId": "<string>",
  "metadata": {}
}
'

{
  "id": "<string>",
  "url": "<string>",
  "status": "PENDING",
  "amount": 123,
  "currency": "<string>",
  "productName": "<string>",
  "createdAt": "2023-11-07T05:31:56Z",
  "externalCustomerId": "<string>",
  "expiresAt": "2023-11-07T05:31:56Z",
  "completedAt": "2023-11-07T05:31:56Z",
  "metadata": {}
}