curl --request POST \
  --url https://sandbox.tight.com/v6/integrations/qualpay/connection \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "merchantId": "<string>"
}
'

{
  "data": {
    "merchantId": "<string>"
  }
}