API Integration.

Start with the business handoff

Common scopes include passing an enquiry to a CRM, synchronising selected records or sending an order event to another application. We identify the exact action and record set before connecting systems.

If a supported built-in connector already handles the workflow, it may be simpler than custom code. Custom integration is appropriate when mapping, rules or reliability requirements need more control.

Define the contract between systems

We review both APIs, account permissions and provider limits. The mapping identifies required fields, identifier relationships and how updates or deletions should be handled. A source-of-truth rule prevents the two systems from repeatedly overwriting each other.

Authentication may involve scoped API credentials or OAuth, depending on the provider. Access is limited to the agreed data and operations, with secrets stored in the server environment.

Implement events and repeat-safe actions

Incoming events are verified using the provider’s supported method. Where an event may be delivered more than once, the integration tracks applicable identifiers or processing states to avoid duplicating the business action.

Retries have a limit and account for provider rate limits. Failed records are recorded in an agreed form for review, while logs avoid unnecessary personal data and credentials.

Follow the whole flow in testing

I test successful transfers, invalid records, unavailable services and duplicate events within the agreed environments. The check confirms that the destination contains the intended result, rather than stop at an accepted HTTP request.

A reconciliation approach helps your team identify missing or mismatched records. If replay or a staff error dashboard is needed, its access model and controls are included explicitly in the proposal.

Integration code and an operating guide

You receive the connection code, field mapping, required configuration, verification notes and instructions for the agreed failure cases. The handover identifies provider dependencies, account ownership and costs outside the development fee.

Ongoing maintenance may be needed when external APIs change. The proposal distinguishes the initial integration from monitoring and later provider-driven updates.

Bring documentation from both systems

Share the two applications, the records or events to exchange and any available API documentation. Explain which system owns the information and who handles exceptions. If API access is not available, we establish that limitation before promising the workflow.