I would be happy to help, but to understand what you want to achieve, would you mind sharing your use case?

I have a store that sells automations for e-commerce shops. These automations are services that are deployed on Railway, but it's very repetitive to deploy them manually. What I'm looking to do is that when my customer pays for their automation on my website, it automatically deploys the service on Railway with deploy, becomes functional, and returns the service's domain on Railway to me

You would want to call serviceCreate without the source, then call serviceConnect specifying a source in the input, this will then trigger a deployment with the source provided in the input.

Thank you very much, I've managed to create and deploy the service by creating the serviceConnect