10. For Integration Specialists – Connect APIs and external systems
This path shows how an API connection becomes a secure, observable and technically reliable X-ERP integration.
Good integration is hardly noticeable: orders arrive exactly once, inventories remain understandable, errors are reported with context - and no one has to repair a spreadsheet every morning.
The interface as a product
The X-ERP Reseller API provides shared areas for authentication, items, partners, receipts and warehouse. It only becomes suitable for production through a data contract, rights, pagination, idempotence, competition control, monitoring and a practiced restart.
This makes the connection robust
- Clarify process, governing system, data ownership, permitted actions and success criteria.
- Use your own integration user with minimal API rights.
- Log in using HTTPS and only use the session cookie in the protected client context.
- Implement filters, pagination, external keys and controlled writing rules.
- Treat errors by cause; Build in idempotence, RowVersion checking and restart.
- Test load, edge cases, authorizations and partial errors before going live.
Prove production readiness
- Each data flow has leading system and unique key.
- 401, 403, 409 and validation errors result in different responses.
- No retry can trigger duplicates or double postings.
- Logs explain the run without storing secrets or complete payloads.
- An outage can continue from a secure checkpoint.
Mistakes that only become expensive during operation
- Swagger visibility is confused with support sharing.
- Large tables load completely and block operation.
- CRUD is misused for technical actions such as posting, canceling or storing.
This is what you take with you
You are not building a fragile data line, but rather your own small operating product with clear contracts and boundaries.
In this chapter
- Introductory video
- APIs
- 01. Integration architecture and supported scope
- 02. Authentication and session cookies
- 03. API permissions and a dedicated integration user
- 04. Endpoints, data contracts and responses
- 05. Filtering, pagination and large datasets
- 06. Synchronize items and business partners
- 07. Integrate documents and inventory safely
- 08. Write operations, idempotency and concurrency
- 09. Troubleshooting, logging and recovery
- 10. Testing, acceptance and production operation
Related topics
- For integration specialists – connecting APIs and external systems › Basic video
- For integration specialists – connecting APIs and external systems › 01. Integration architecture and release limits
- For integration specialists – connect APIs and external systems › 02. Login and session cookie
- For integration specialists – connect APIs and external systems › 03. API rights and your own integration user
- For integration specialists – connecting APIs and external systems › 10. Testing, acceptance and production operations
Frequently asked questions
**How does an API client log in?**
POST to /api/WebApiUser/WebApiLogin; the client stores the returned session cookie securely and sends it with subsequent calls.
**Which areas are documented?**
In the tested reseller API: items, partners, documents/items as well as warehouse information and warehouse movements.