curl --request POST \
  --url 'https://api.stateset.com/api/v1/subscriptions' \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
  "coupon_code": null,
  "customer_id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
  "payment_method_id": null,
  "plan_id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
  "skip_trial": null
}'

{
  "billing_interval": "string",
  "created_at": "string",
  "currency": "string",
  "customer_id": "string",
  "id": "string",
  "price": "string",
  "status": "string",
  "updated_at": "string"
}