Connect your systems. Streamline your workflows
We design and build custom APIs that connect your website, apps and tools – saving time, reducing errors and unlocking growth opportunities.
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Decide whether custom APIs are right for you
Manually transferring data between systems wastes time and increases errors. Off-the-shelf integrations often don’t fit your processes.
At Mr Digital, we build custom APIs that connect the dots, linking your website with CRMs, booking systems, payment gateways, marketing platforms and more.
See what custom APIs can deliver
We’ve helped ambitious brands integrate their systems with customer APIs.
Live Sync
Arthur ↔ Spaceflow
Leases and users stay in lockstep; access auto-revoked at move-out, no manual updates.
+13,000
Leads
+13,000 verified leads from CRM-driven digital campaigns with custom APIs
74
Sites Launched
74 Sites launched in less than 9 Months; phased WordPress rollout with centralised Events API
Choose the API services you need
Connect your systems, automate workflows and create smarter digital experiences with our full suite of API services. From custom builds to third-party integrations, we help your platforms work seamlessly together, securely and at scale.
Custom API Development
Tailored to your systems and workflows.
3rd Party Integrations
Connect CRMs, ERPs, marketing platforms and more.
Payment Gateway APIs
Secure, reliable transaction handling.
Booking System Integrations
Automate reservations and scheduling.
Ongoing Support
Maintenance and upgrades for custom APIs.
Every week, our team reflects on how they’ve lived these values, so they stay front and centre in everything we do.
Follow a proven build framework
We apply our Conversion-Focused Infinity-5 Framework to every API project
Map processes and define integration requirements.
Set measurable efficiency or revenue goals.
Build and test the API for stability.
Refine performance, security and scalability.
Expand integrations as your business grows.
Compare us with other agencies
Most agencies avoid setting targets until months in. We do it upfront.
| Other Development Agencies |  | |
|---|---|---|
| Strategy | Rely on pre-built connectors | Bespoke APIs built for your processes |
| Support | Limited support | Ongoing maintenance |
| Expertise | Often delivered by junior developers. | Delivered by expert developers with 10+ years experience. |
| Pricing | TBC | Clear, transparent pricing – no hidden fees |
Learn from real results
Our WordPress websites have delivered measurable impact for national and local brands
CERT Property
Data Entry
Automated: Tenant and lease records now auto-sync between systems, cutting admin time and errors.
The Vulnerability Initiative
+40%
lower CPL vs. industry benchmarks
RedCat Independent Pubs
3 Week Delivery
of centralised events API created for 70+ sites
Ready to save time and scale smarter?
If you want systems that talk to each other and processes that run seamlessly, let’s talk.
Ross Crawford, Managing Director – helping ambitious brands turn ideas into measurable growth.
It’s the process of building or integrating APIs so your systems communicate seamlessly – connecting CRMs, websites, booking tools, and databases to reduce manual work and improve accuracy.
Most integrations take 3-6 weeks, but complex or multi-system builds may need longer. We outline clear milestones and test each stage before deployment.
Yes. We work with CRMs, ERPs, booking platforms, payment gateways and custom software. We’ll review documentation, design the endpoints, and ensure secure, stable data flow.
Yes, you retain full ownership. We deliver complete documentation so your internal or third-party developers can maintain it confidently.
We don’t guarantee absolute uptime, but we engineer APIs for reliability and monitor performance continuously. Targets are agreed at project start based on load requirements and SLA expectations.
All APIs are built using HTTPS, token or key-based authentication and encrypted data transfer. We follow GDPR and industry best practices for security and privacy.
Ongoing monitoring, version updates, endpoint adjustments and bug fixes. We can also expand functionality as your business evolves. Support is billed hourly or via retainer.
Development time varies with complexity, so we provide a scoped estimate. Work is charged at £75+vat/hour, with reduced rates in retainers. For enterprise-level or continuous integration work, rates can drop to £65/hour.
Yes, we can share relevant case studies on a call. We’ve built booking integrations, product-feed APIs and CRM connectors for brands across multiple industries. Each example shows measurable efficiency gains and ROI improvements.