Create a new credit grant

curl --request POST \
  --url https://api.cloud.flexprice.io/v1/creditgrants \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '{
  "cadence": "ONETIME",
  "credits": 123,
  "expiration_duration": 123,
  "expiration_duration_unit": "DAY",
  "expiration_type": "NEVER",
  "metadata": {},
  "name": "<string>",
  "period": "DAILY",
  "period_count": 123,
  "plan_id": "<string>",
  "priority": 123,
  "scope": "PLAN",
  "subscription_id": "<string>"
}'

{
  "cadence": "ONETIME",
  "created_at": "<string>",
  "created_by": "<string>",
  "credits": 123,
  "environment_id": "<string>",
  "expiration_duration": 123,
  "expiration_duration_unit": "DAY",
  "expiration_type": "NEVER",
  "id": "<string>",
  "metadata": {},
  "name": "<string>",
  "period": "DAILY",
  "period_count": 123,
  "plan_id": "<string>",
  "priority": 123,
  "scope": "PLAN",
  "status": "published",
  "subscription_id": "<string>",
  "tenant_id": "<string>",
  "updated_at": "<string>",
  "updated_by": "<string>"
}