“Connect our CRM to operations” is not enough to estimate the work or accept the result. A useful brief answers four questions: what moves, who is authorized to send it, what success means and how both sides handle rejection and change. Begin with one use case, a non-sensitive example payload and a business outcome the process owner can verify.
API Integration & Development includes documented data contracts, permissions, error handling and versioning as well as the connection. It does not imply unrestricted access to every system or guarantee feasibility before the actual interfaces and account capabilities are reviewed.
Define the direction and boundaries
Write down the trigger and outcome. For example, an approved service request in the sales system creates an operational work order. That does not mean every customer, file and note synchronizes in both directions. Returning a completion status to the first system is a second operation with its own fields, authority and rules.
Name the authoritative source for each fact. Who can amend the service address after handoff? Which system owns cancellation? If both can edit the same value, agree a conflict rule. Product Discovery & Requirements should resolve those questions with the process owners before they become implementation instructions.
List exclusions such as historical records, large attachments, reference-data changes and further third-party connections. “Complete integration” should not replace a defined operation list.
Make the field contract testable
Create a mapping table containing each field’s names in both systems, meaning, type, required status, valid example and treatment when absent. Distinguish an empty value from zero and from unknown. Define the time format and time zone, customer identifier and request identifier rather than relying on names alone for matching.
Where useful, describe the interface in a structured format. The OpenAPI Specification provides a standard description for HTTP APIs. The version reviewed for this guide is 3.2.1; a project should select a version supported by its tooling, not upgrade merely because a newer specification exists. An interface description does not independently decide the business meaning of a field.
Keep actual credentials and customer records out of contract examples. Use test identifiers and explain how an authorized person obtains access securely, rather than embedding the access secrets in the document.
Worked hypothetical: an approved request becomes a job
Suppose the source sends request REQ-204, customer identifier C-18, a service code, a site and a requested date. The destination returns work-order identifier JOB-901 and a defined acceptance state. The integration retains the relationship between the two identifiers so an employee can locate the outcome without searching by customer name.
A second request contains an unknown service code. Under the proposed contract, the receiving system rejects it with an actionable reason and retains its reference. It does not create an incomplete job or substitute a default service. The authorized data owner corrects the request and resubmits through the agreed route.
Now suppose the sender times out before receiving confirmation. The user cannot assume creation failed: the destination may have created the job without delivering the response. The contract therefore specifies how to determine the original request’s outcome before creating a replacement. Detailed duplicate-event recovery and ongoing reconciliation require an operating scope beyond the field contract itself.
Allocate responsibility for access and failure
Who owns the service account? Who grants and renews permissions? Who announces an endpoint change or usage-limit change? Who resolves a rejection caused by business data? The technical supplier should not silently become the decision owner for both business systems.
Define behavior by error class. Invalid data needs correction; insufficient authority needs an access review; a temporary outage needs a controlled recovery path. A universal “something went wrong, try again” message does not tell the business what to do. Conversely, an employee-facing error should not reveal secrets or unnecessary internal infrastructure details.
An integration may require an additional review screen or workflow step. If so, include that in an agreed App Development scope. Activating an API does not automatically deliver the application changes needed around it. Separate the output, cost and acceptance owner for those changes.
Agree what can be observed safely. A correlation reference may be enough for support to trace a failure without copying entire sensitive payloads into every log or ticket. The information retained should match the approved operational and security requirements.
Accept evidence from both sides
Work with Software Quality Assurance to define a small test pack with known outcomes. Cover a valid request, a missing mandatory field, an unknown code, insufficient permission, interruption before the outcome is known and an agreed interface-version change.
For each case, retain a sanitized request, the response and the resulting state in both systems. A successful response code alone is weaker evidence than the correct work order linked to its original request.
Name the person who reviews rejected records and specify how those records become visible. Agree an operationally realistic handling time rather than allowing unresolved requests to disappear into a technical log.
Handover should include the contract, version information, account ownership and change-request process. Verify the intended environment: a successful sandbox test does not establish that production permissions or configuration are identical. Any live operation still requires the appropriate authorization and access.
Frequently asked questions
Does an available API make integration immediately feasible?
No. Review available operations, plan restrictions, permissions, limits and provider documentation. An interface might allow reading when the workflow requires creation or amendment.
Do we need two-way synchronization?
Only if the process requires it. Restricting directions and fields to what is necessary clarifies ownership. The scope can expand later through another explicit contract.
Who approves field names and meanings?
Data and process owners, working with the technical team. Developers determine representation and implementation, but should not independently decide the meaning of accepted or cancelled.
Is one successful request enough for acceptance?
No. Test rejection, permissions and unknown outcomes, then verify the final record on both sides. A connection that works once has not demonstrated the complete agreement.
Start with one request you want to move and the result you expect. That is a stronger estimation brief than a long list of system names without rules governing their interaction.
Reference
- OpenAPI Specification 3.2.1, reviewed 26 October 2026. All request, customer and job identifiers in the example are invented.
