curl --request PUT \
  --url https://sandbox.api.veepag.com/v1/subscription \
  --header 'Content-Type: application/json' \
  --header 'apiKey: <api-key>' \
  --data '
{
  "_id": "<string>",
  "companyId": "<string>",
  "productId": "<string>"
}
'

{
  "_id": "subscription_id",
  "productId": "product_id"
}