curl --request POST \
  --url https://revstack.dev/v1/subscriptions \
  --header 'Content-Type: application/json' \
  --data '
{
  "customerId": "<string>",
  "planId": "<string>",
  "priceId": "<string>",
  "couponId": "<string>"
}
'

{
  "id": "<string>",
  "success": true
}