curl --request POST \
  --url https://api.sprucecollective.co.uk/subscriptions/use-credits \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "credits_to_use": 2,
  "raffle_id": "<string>",
  "usage_type": "raffle_entry"
}
'

{
  "credits_remaining": 123,
  "credits_used": 123,
  "entries_created": 123,
  "message": "<string>",
  "payment_id": "<string>",
  "success": true,
  "usage_id": "<string>"
}