curl --request POST \
  --url https://mainnet.gomaestro-api.org/v1/contracts/subscription/createUserAccount \
  --header 'Content-Type: application/json' \
  --header 'api-key: <api-key>' \
  --data '
{
  "email": "<string>",
  "phone": "<string>",
  "subscriber_address": "<string>"
}
'

{
  "cbor_hex": "<string>",
  "tx_hash": "<string>"
}