I'm trying to create a new service in my Railway project using the GraphQL API via Postman, but I keep getting the error:

{
  "errors": [
    {
      "message": "Problem processing request",
      "traceId": "someID"
    }
  ]
}

▶️ What I’m Doing:

• Mutation: serviceCreate($input: ServiceCreateInput!)
• Tool: Postman (GraphQL support)
• API URL: https://backboard.railway.app/graphql/v2
• Auth: Bearer token in headers

🔧 Variables:

{
  "input": {
    "projectId": "d1909034-17dd-4603-9f3d-10b4496ad718",
    "name": "my-service",
    "source": {
      "type": "GITHUB",
      "github": {
        "repo": "ru-dr/yatrazen",
        "branch": "main",
        "rootDirectory": "/"
      }
    }
  }
}

✅ Confirmed:

• Project ID exists and is correct.
• Token is valid and working for other queries (me, teams, etc.).
• GitHub repo ru-dr/yatrazen exists, is public, and branch main is available.

❓ Any idea what might be going wrong?

Context — What I’m Building

I’m working on a platform where users can:

• Upload or connect their GitHub projects
• Deploy them to Railway via my custom API
• Automatically get a deployment link (preview/production)

The goal is to abstract Railway for end-users and let them use it via my system. For this, I’m integrating the Railway GraphQL API to:

1. Create projects
2. Create services from user GitHub repos
3. Retrieve deployment URLs

But right now, I’m blocked at the service creation step using the GraphQL API — it returns Problem processing request.

If anyone from the Railway team or community has experience with automated service deployments via the API, I’d appreciate help figuring out what I’m missing.