Custom API Integrations That Connect Your Business
Modern businesses rely on multiple software systems — a CRM for sales, accounting software for finances, an e-commerce platform for orders, a fulfilment system for despatch. When these systems don't talk to each other, the gaps between them become a source of manual work, errors and wasted time.
API integrations solve this. By connecting your platforms at the data level, we eliminate manual processes, reduce errors and give your team a single source of truth across your systems. At White Label Developing, we build clean, reliable API integrations that keep your systems working together seamlessly.
API Integration Services
CRM Integrations
Your CRM is only as valuable as the data in it. We integrate CRM platforms with your website, e-commerce store, marketing tools and internal systems — ensuring that leads, customers and interactions are captured automatically and accurately without manual data entry.
Common CRM integration scenarios include: pushing website form submissions into your CRM as contacts or leads, syncing e-commerce orders and customer data, automating deal creation from enquiries, bidirectional contact sync between platforms and triggering CRM workflows based on external events.
We work with HubSpot, Salesforce, Zoho, Pipedrive, Copper, ActiveCampaign and a wide range of other CRM platforms, as well as building custom integrations for bespoke CRM systems.
Accounting System Integrations
Accounting integrations save finance teams significant time and reduce the risk of errors from manual data transfer. We connect e-commerce platforms, invoicing tools and business systems to accounting software — ensuring invoices, payments and financial data flow automatically.
Platforms we integrate include Xero, QuickBooks, Sage, FreeAgent and FreshBooks. Integration work typically includes: automated invoice creation from orders, payment status synchronisation, customer and contact sync, product and service mapping, and reconciliation reporting.
Payment Gateway Integrations
Payment integration requires careful technical implementation and rigorous security. We build custom payment gateway integrations for websites and applications, handling the complexity of payment flows, webhook processing, refund handling and subscription billing.
We work with Stripe, GoCardless, PayPal, SagePay, Worldpay and other payment providers. All payment integrations are built with security as a priority — following PCI compliance best practices and using tokenisation to avoid handling card data directly.
Data Synchronisation Systems
When data needs to flow between multiple systems on an ongoing basis, a robust synchronisation system is required. We build data sync solutions that run reliably in the background — handling conflicts, errors and edge cases gracefully, with logging and alerting when issues arise.
Third-Party Platform Integrations
Beyond CRM and accounting, businesses often need integrations with a wide range of third-party services. We have experience integrating with delivery and logistics APIs, property portals, marketing platforms, communication tools, healthcare systems, HR platforms, ticketing systems and many other third-party services.
If the platform has a documented API, we can integrate with it. Where documentation is limited or the API is unusual, our experience across a wide range of integration scenarios means we can work through the complexity.
Building Custom APIs
Sometimes the requirement isn't to consume a third-party API but to build your own — exposing your system's data and functionality to other platforms, mobile apps or partners. We design and build custom REST APIs that are well-structured, properly authenticated and well-documented.
Custom API development includes: API design and documentation, authentication (OAuth 2.0, API keys, JWT), rate limiting and throttling, versioning strategy, and comprehensive testing to ensure reliability.
WordPress and Shopify API Integrations
Many of our API integration projects are within the WordPress and Shopify ecosystems — connecting these platforms to external services. Whether it's connecting a WooCommerce store to an accounting system, pushing WordPress form submissions into a CRM, or integrating Shopify with an ERP, we handle the full technical implementation.
For WordPress-specific integrations, see our WordPress Development page. For Shopify integrations, see Shopify Development.
How We Approach API Integration Projects
Good API integrations are built with reliability and maintainability in mind from the start. Before writing a single line of code, we review the documentation for each platform involved, understand the authentication requirements, map the data fields between systems and plan for edge cases and error scenarios.
We build integrations that fail gracefully — logging errors properly, alerting when things go wrong, and queuing retries rather than losing data. An integration that breaks silently is often worse than one that doesn't exist at all.