List Credit Grants for a customer

curl --request GET \
  --url https://eu.sequencehq.com/api/credits/{customerId}/grants \
  --header 'Authorization: <authorization>'

{
  "items": [
    {
      "id": "22efb229-c474-407c-bbf7-f5e113ee8b20",
      "name": "API Calls",
      "grantAmount": 1000,
      "balance": 324,
      "issueDate": "2022-02-22",
      "expiryDate": "2030-03-03"
    }
  ]
}