A customer submits a request, your CRM creates a record, and your scheduling system opens a job. Then a connection times out. If the integration tries again, will it recognize the original request or create a second job?
Connecting applications is only the beginning. A dependable integration also needs to recognize repeat messages, preserve the right record, and show your team when something needs attention. Here is what small-business owners should ask for before connecting their systems.
Give each business action a stable reference
Consider a fictional service company moving approved estimates into a job system. The estimate's unique reference should travel with the request. If the same approval arrives twice, the destination should find the existing job instead of opening another one.
A customer name, dollar amount, or timestamp alone is usually a poor substitute. Two legitimate jobs can share all three. Keep the source system's record identifier and a link to the destination record so staff can trace what happened.
Plan for repeat and late messages
A webhook is an automatic notification from one application to another. Stripe documents that webhook events can arrive more than once and are not guaranteed to arrive in generation order. Its guidance recommends tracking processed event identifiers. These are useful examples of why integrations must be designed around delivery behavior rather than assuming every message arrives exactly once. Read Stripe's webhook guidance.
Ask your developer to demonstrate a repeated update and a late update. The repeated message should not create duplicate work. A late message should not quietly overwrite a newer, valid status. The correct handling depends on which application owns that information.
Make retries safe in both directions
When an application sends a request and loses the response, it may not know whether the other system completed the action. Some APIs support an idempotency key: a reference that lets a retry represent the same intended action. Stripe supports this mechanism, with behavior and retention rules documented for its APIs. Read Stripe's idempotent-request documentation.
Your integration still needs its own durable record of completed business actions. An API's temporary retry protection does not replace that record, and support differs between providers. Ask how the design handles a retry tomorrow, two simultaneous requests, or a successful update followed by a local failure.
Give staff a useful exception queue
When a customer cannot be matched or required information is missing, send the item to review. A useful queue shows the source reference, the reason it stopped, the last attempt, and who owns the next step. Staff should be able to correct the problem and retry without creating a second transaction.
Keep sensitive information out of routine logs. Verify incoming notifications using the provider's supported authentication or signature checks before allowing them to change business records.
Use a small acceptance checklist
- Submit the same request twice: only one intended business record is created.
- Interrupt the connection after the destination saves: retrying finds the existing result.
- Deliver an older update after a newer one: the final status remains correct.
- Send incomplete information: the item appears in a review queue with a clear owner.
- Compare source and destination records: missing items can be identified and investigated.
Run these checks with test data before launch. Track unresolved items and how long they wait, rather than measuring success only by the number of messages sent.
At Titan DevOps, our recommendation is to define the record ownership, retry behavior, and review process alongside the connection itself. Explore our integration and custom application services, or tell us which systems your team needs to connect.