For existing software
API Development & Integration
Robust, well-documented REST and GraphQL APIs, plus third-party integrations that connect your entire technology ecosystem.
- REST
- GraphQL
- Webhooks
- OAuth
What is API development and integration?
An API is a defined way for two pieces of software to exchange data without a person in the middle. API development and integration means building those interfaces for your own systems, and connecting to the ones your suppliers, payment providers and internal tools already publish.
Most integration work exists because information is entered twice. An order is taken in one system and retyped into another; stock is counted in one place and reported from a second. An integration replaces that step with a rule: when this happens there, do this here. The hard parts are rarely the request itself — they are authentication, handling failures, avoiding duplicates, and knowing which system is the source of truth when two disagree.
What ABM provides
- API design and documentation
- REST and GraphQL development
- Payment, CRM and ERP integrations
- Webhooks and event-driven sync
- Authentication with OAuth and API keys
- Rate limiting, logging and monitoring
What can be built
- REST and GraphQL APIs for your own product, with documentation
- Integrations with CRM, ERP and accounting systems
- Payment gateway integration and reconciliation
- Webhook endpoints and event-driven synchronisation
- Scheduled imports and exports between systems
- Partner and public APIs with keys, scopes and rate limits
- Middleware that sits between systems that cannot talk directly
Who API development and integration is for
- Businesses running several systemsA CRM, an accounting package and a store that each hold part of the same truth.
- Teams doing manual data entryWhere a person is the integration, and the errors are the cost.
- Products with partnersWhen customers or resellers need programmatic access to your data.
- Anyone taking paymentsPayment gateways, reconciliation and the webhooks that keep records straight.
How API development and integration works at ABM
- 01Map the dataWhich system owns each piece of information, what must stay in step, and how often.
- 02Design the interfaceEndpoints, payloads, error responses and versioning, written down before implementation.
- 03AuthenticationOAuth, API keys or tokens, with scopes so each consumer gets only what it needs.
- 04Build and documentImplementation with reference documentation another developer can work from without asking.
- 05Handle failureRetries, idempotency so nothing is processed twice, and a dead-letter path for what cannot be delivered.
- 06MonitorLogging, rate limiting and alerts, so a broken integration is noticed by you rather than by a customer.
Technologies and integrations
The exact stack is chosen per project and agreed with you in writing before development starts. These are the tools and categories we work with for API development and integration.
Interfaces
- REST
- GraphQL
- Webhooks
Authentication
- OAuth 2.0
- API keys
- Tokens and scopes
Integration targets
- Payment gateways
- CRM systems
- ERP and accounting systems
- Email and messaging services
Reliability
- Retries and idempotency
- Rate limiting
- Logging and monitoring
- Versioning
When to choose API development and integration
- The same information is typed into more than one system.
- Two systems regularly disagree and someone has to reconcile them by hand.
- Another business needs programmatic access to your data.
- A report takes hours because the data has to be pulled from several places first.
When something else fits better
- Software DevelopmentThere is no system that owns the process yet, and connecting what exists would only join up the gaps.
- App Audit & RecoveryAn integration already exists and the problem is that it silently fails.
- Enterprise Software DevelopmentThere are many systems, several teams, and compliance or security requirements around the data.
Where API development and integration usually fits
Related services
Questions
API Development & Integration: common questions
What is API integration?
It is connecting two pieces of software so they exchange data automatically through a defined interface, instead of a person exporting from one and importing into the other. A typical integration listens for an event in one system, transforms the data, and writes it into another, with retries and logging so failures are visible.
Can you integrate with a system we already pay for?
If it publishes an API or supports file-based exchange, then usually yes. If it does not, the options are narrower and sometimes the honest answer is that a reliable integration is not possible. We check that before quoting rather than after.
What happens when the other system is down?
A well-built integration queues the work, retries with a delay, and keeps a record of anything it could not deliver so it can be replayed. Without that, an outage silently loses data, which is the most common defect we find in integrations built by someone else.
Do you document the API?
Yes. A reference another developer can build against is part of the deliverable, not an extra. An undocumented API is a dependency on whoever wrote it.
How do you keep an API secure?
Authentication on every endpoint, scopes so each consumer gets only what it needs, rate limiting, validation of everything that comes in, transport encryption, and logs that show who called what.
Thinking about API development and integration?
Send a short brief. We'll reply within one business day with a next step, or honest advice if we're not the right fit.