curl --request POST \
  --url https://api.useduro.com/v1/subscriptions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "customerId": "<string>",
  "planId": "<string>",
  "paymentMethodId": "<string>",
  "metadata": {}
}
'

{
  "id": "<string>",
  "planId": "<string>",
  "currentPeriodStart": "<string>",
  "currentPeriodEnd": "<string>",
  "cyclesCompleted": 123,
  "createdAt": "<string>"
}