API development and systems integration — US
The cost of an integration usually appears after the first successful request. A record changes twice, credentials expire or two systems disagree about the customer. The design needs to make those situations recoverable and understandable.
FI Digital builds integration around the business transaction, not simply the available endpoints.
We define authoritative records, permitted actions and confirmed completion states before choosing a connector, middleware or custom API approach.
What the engagement covers
Specify identifiers, fields, events and which system owns each value.
Define authentication, authorization, versioning and data validation for supported interfaces.
Handle retries, duplicate events, partial completion and unavailable systems with visible exceptions.
Test end-to-end outcomes, document dependencies and provide monitoring and recovery instructions.
FI DIGITAL / WORKFLOW
API development and systems integration
- Contract and ownership
- Interface design
- Review and authorise
- Verification and handover
- Resolve with the owner
A practical example
An illustrative website lead is sent to a dealer CRM. A successful HTTP response may not mean the lead was accepted. The integration should record the destination acknowledgement and preserve a traceable state for retry or investigation.
Relevant delivery experience
Australian group delivery example: an anonymous automotive OEM connector was deployed across 232 dealerships in two months using Zoho Catalyst and custom development. Leads transferred in seconds. The client confirmed approximately three hours saved per week at OEM level in total, and approximately one hour per week at each dealership. These are figures for that engagement, not forecasts for another project.
Questions that shape the scope
Use these questions to identify the first decision and the information needed to make it.
- Which system owns each field?
- What proves business completion?
- Can a retry duplicate an action?
- Who owns interface changes?
Scope the US workflow and its dependencies
Identify the US business process, contracting entity and system owners before using a global template. Multi-state or multi-entity requirements, supported provider accounts and working-hour coverage should be explicit where they affect delivery. The project should have a named acceptance owner and an agreed support arrangement; no local office or round-the-clock coverage is implied.
From assessment to an accepted result
Agree the user, workflow, expected outcome and acceptance owner. Identify the important unknowns early.
Set out records, interfaces, permissions and dependencies. Make failure recovery part of the design.
Review usable work against representative scenarios. Keep decisions and scope changes visible.
Confirm acceptance, rollback, account ownership, documentation and the support arrangement.
Control cost around the work that matters
AI-assisted development, reusable components and supported connectors can reduce parts of the build effort. They do not remove the need to agree requirements, resolve conflicts between systems, review permissions or accept the business result. Keep the first release bounded and compare proposals against the same interfaces, tests, handover and support responsibilities. Ask which recurring provider charges and maintenance tasks remain after launch. Senior coordination is most useful where it resolves a concrete dependency or decision; it should be visible in the scope. The aim is a maintainable working outcome at an understood total cost, not additional complexity for its own sake.
What your team should receive at handover
The handover should cover the working application or integration, relevant source and configuration access, deployment instructions and the accepted test evidence. Document the important dependencies and the actions that require an authorized owner. A useful release record explains what is included, what remains outside scope and how the team can recover from an ordinary failure. These materials support maintainability; they do not replace a separately agreed support arrangement.
Scope and responsibilities
The scope, acceptance criteria, third-party dependencies and operating responsibilities are agreed for the engagement. No partner tier, certification, guaranteed saving or fixed delivery period is implied.
CRM, ERP and finance systems integration
A customer order can cross several systems before it becomes an invoice and a payment. Each transition needs clear ownership, because an incorrect update can affect stock, customer commitments and financial records at the same time.
FI Digital designs commercial-system integrations around the transaction lifecycle. The work defines authoritative data, posting boundaries, reconciliation and exception handling so sales and finance can understand the same business event.
Trace quote, order, fulfilment, invoice, credit and payment states.
Agree customer, item, price and account identifiers across systems.
Validate messages, prevent duplicate postings and handle partial completion explicitly.
Compare business states and totals, with an owner for unresolved differences.
Scope and acceptance
The scope, acceptance criteria, third-party dependencies and operating responsibilities are agreed for the engagement. No partner tier, certification, guaranteed saving or fixed delivery period is implied.
- Who authorises a financial posting?
- How is an order matched across systems?
- What happens after cancellation?
- Who resolves reconciliation differences?
Frequently asked questions
Can you integrate systems without replacing them?
Often the first assessment should explore that option. A useful integration can preserve the existing systems while improving a specific handoff. The decision depends on available interfaces, data ownership and operating limits. Compare the maintenance cost and reliability of the connection with other options before committing to a build.
Why does integration testing include failed requests?
Real systems experience timeouts, duplicate events and incomplete data. Testing only successful calls does not show whether the business can recover safely. The test plan should prove that failures remain visible, retries do not repeat a completed action and an accountable person can reconcile the final state across both systems.
Can the project start with a smaller first release?
Yes, if the first release covers a useful end-to-end workflow rather than disconnected screens. Agree the user, outcome, acceptance checks and operational owner. Keep later features visible without placing them all in the initial scope. The first release should test the important assumptions and leave a maintainable foundation for the next decision.
How are cost and delivery time estimated?
The estimate follows the agreed workflow, interfaces, data, permissions and operating requirements. Discovery should expose uncertain dependencies before they become hidden commitments. Break the work into reviewable milestones and state assumptions, exclusions and third-party costs. A fixed number of weeks or a low starting price is not a reliable substitute for a defined delivery scope.
Can you integrate with our existing systems?
Integration depends on the systems’ available interfaces, access rights, limits and commercial terms. Review the actual records and actions required before choosing a connector or custom interface. Define identifiers, retry behaviour, duplicate prevention and reconciliation. The proposal should distinguish supported actions from capabilities that still require discovery or permission from another system owner.
Who owns the software and accounts?
Ownership, licensing and access should be explicit in the agreement. Distinguish custom code from existing product components, third-party services and open-source dependencies. Agree where repositories, cloud accounts, credentials and documentation will be controlled, and what is handed over. Do not assume that commissioning a project automatically transfers every underlying software right or provider account.
How do you test before launch?
Test the business workflow, user permissions, ordinary failures and recovery, using representative scenarios agreed with the people who will operate the result. Include data quality and integration behaviour where relevant. Record acceptance and unresolved issues before release, with a rollback or fallback appropriate to the change. A demonstration of the happy path is only one part of readiness.
Is ongoing maintenance included?
The proposal should distinguish delivery, warranty or defect correction, and ongoing operational support. Dependencies, usage and business requirements can change after launch, so assign ownership for updates and monitoring. Support hours, response targets and service levels require a specific agreement. They should not be assumed from a general description of development or platform operations services.