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Custom API integration

  • Connect your site to the tools you already use
  • Stable, secure integrations
  • Cleaner data flow in and out

Service details

Abstract graphic of connected modules and central block symbolising custom API integrations.Abstract graphic of connected modules and central block symbolising custom API integrations.

We connect your website to the tools that already run your business, using clean, reliable APIs. Your data flows more consistently between Webflow, Framer or WordPress and the systems your team lives in every day.

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15-30 minute strategy call, no charge

Turn your website into a connected hub

Many websites still behave like islands. Forms arrive as emails. Leads are pasted into CRMs by hand. Bookings are checked against calendars manually. Over time this creates delays, errors and a constant worry that something has slipped through the cracks. Custom API integration changes that. We design and build the connections that let your website talk directly to the tools that matter, so information moves automatically and consistently instead of being shuffled around by people.

We begin with a simple question. After someone fills in a form, books a call or completes a step on your site, what should happen next and where should that data live? That might be a lead entering your CRM with the right tags, a booking landing in your scheduling system, an application triggering an internal review or a payment syncing into a finance tool. We map each journey clearly so there is no ambiguity about what should happen at each step. The aim is not automation for its own sake. It is fewer manual tasks, fewer gaps and fewer surprises.

Designing integrations that fit how you work

Every business has its own stack and its own way of working. A good integration respects that rather than forcing everything into a one size fits all pattern. Once we understand your flows, we decide how best to connect them. Sometimes a direct API call from Webflow, Framer or WordPress is the right answer. Sometimes it is safer and clearer to use a small intermediary service or to formalize what you already do in an existing automation platform.

Before any code is written we document triggers, payloads and responses in plain language. What exactly kicks the integration off. Which fields are required. How we should treat duplicates. What should happen when a provider is slow or temporarily unavailable. This avoids the common situation where only one developer understands the integration and everyone else feels nervous about changing anything. It also means that when your processes evolve there is a clear map that shows what needs to be updated.

Cleaner, more reliable data between systems

Most frustration with integrations comes from messy data rather than the API itself. Field names are inconsistent. Values arrive in formats nobody expected. Records are created without the information a team needs to act. As part of this service we help you align how data is captured on the website with how it is stored in your downstream systems.

We decide which system should be the source of truth for each type of information and how fields should map. We add light validation at the point of entry so obviously broken data is caught early. That might mean enforcing required fields before a form can submit, standardizing country or product names, or splitting one long text block into structured parts that your CRM or internal tool can report on. The aim is simple. When somebody opens a record in your chosen system, it should contain the information they expect and nothing that confuses them.

Security and reliability as a foundation

Any custom integration touches sensitive territory by default, so we treat security and reliability as a baseline rather than an optional extra. Secrets and API keys are handled through appropriate secure storage. Permissions are scoped to the minimum needed so if anything were compromised the impact is limited. Wherever possible we keep credentials out of templates and public code and rely on configuration instead.

We also plan for failure. Third party services go down. Rate limits are hit. Inputs are not always what anyone anticipated. We add clear error handling and logging so that issues do not sit hidden for months. Requests are retried when it makes sense but not in a way that overwhelms an external service or creates duplicate records. The goal is an integration you can comfortably rely on in daily operations rather than a fragile script that everyone is afraid to touch.

Testing against real journeys, not just perfect ones

Many integrations are only tested on the happy path one clean form submission and one simple response. Real life is rarely that tidy. We run through realistic journeys using staging or test environments wherever possible. Optional fields, unusual values and error cases are all exercised so we can see how the integration behaves when things are less than ideal.

For Webflow, Framer and WordPress sites we test from the moment a user clicks submit through to the record arriving in your downstream tool. We confirm that records are created where you expect them, that they contain the right fields and that any user feedback on the site still feels smooth. If a step feels fragile or confusing we refine the integration or the front end pattern until the whole flow holds up.

Documentation your team can actually use

An integration only becomes a stable part of your operations when more than one person understands it. To support that we create straightforward documentation at the end of each project. It explains what was built in clear language. Which pages, forms or actions trigger which flows. What data is sent where. What typical error messages look like and who should be notified if something fails.

We pair this with short Loom walkthroughs where it helps. That makes it easier for new teammates or internal developers to get up to speed without a long handover call. If you have your own technical team we signpost exactly where they can extend or adjust behavior safely in future so you are not locked into one way of working.

Built for teams who want less manual work and more confidence

This service is for teams who want their website to behave like part of their system of record, not a disconnected brochure. If you are tired of copying and pasting from emails, chasing missing leads and wondering which tool holds the latest information, a custom API integration gives you a way out. You keep the tools that already work for your business and gain a cleaner, more predictable way for them to talk to each other.

What you get

  • Integration discovery and mapping

    Clear description of the data flows, systems involved, triggers, payloads and edge cases for each integration.

  • API design and configuration

    Setup of API requests, authentication, routing and data structures that connect your website to your chosen tools.

  • Validation and safeguards

    Rules at the form and integration level that protect against bad data, failed calls and unexpected responses.

  • End to end testing

    Realistic testing across staging and production paths, including error states and edge cases, so the integration behaves as expected.

  • Documentation and walkthrough

    Simple diagrams, written notes and Loom videos that explain how everything works for both technical and non technical teammates.

  • Handover and recommendations

    Final review of what was delivered, plus clear suggestions for future improvements and potential additional integrations.

How we work

  1. Kickoff and discovery

    We review your website, your existing tools and your current workflows, then agree which integrations will have the most impact and what success looks like.

  2. Design and mapping

    We map entities, fields and flows between systems and design the simplest, safest architecture that meets your requirements and fits your tech stack.

  3. Build and configure

    We implement the integration across Webflow, Framer or WordPress and any supporting services, handling authentication, data mapping, error handling and logging.

  4. Test, refine and launch

    We run end to end tests, refine behavior based on findings and then move into production with clear documentation, simple monitoring and a plan for future changes.

  • photo of our client Peter MaraziotisPeter Maraziotis

    Highly recommend the website service, these guys go over and beyond to offer the best service. Really happy with my new site Pete M Director PM Properties

  • photo of our client Alona ShaviAlona Shavi

    Zac and his team are fantastic! They listen to everything you want and don't try to sell you something you don't. They offer professional advice and do everything to help you find success through your website. Day 1 our site went live ww already had an inquiry. Highly recommend them, you won't be disappointed!

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    South digital have done a great job designing my website and helping to launch my mobile app. The team are always on hand to answer any questions. Quick service with high quality.

  • photo of our client Billy WillsonBilly Willson

    South Digital did an absolutely amazing job on our new website. It exceeded expectations in every way. Not only do their websites look amazing but they also understand functionality and conversion so your website will actually drive revenue for your business.

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Custom API integration FAQs

Contact us
  • Which platforms and APIs do you work with?

    We commonly connect Webflow, Framer and WordPress sites to CRMs, email platforms, booking tools, payment providers and internal systems. As long as an API is reasonably documented and accessible, we can usually work with it or advise on the best way to integrate.

  • Do we need a developer on our side to work with you?

    Not always. We can handle the technical implementation and explain it in plain language for non technical teams. If you do have internal developers, we are happy to collaborate and agree clear responsibilities so nobody steps on each other.

  • How do you keep integrations secure?

    We store secrets and API keys securely, scope permissions to the minimum needed and handle errors explicitly. We also respect rate limits and provider guidelines. Where appropriate, we can work with your internal security or compliance team to meet additional requirements.

  • What happens if a third party API changes in the future?

    APIs evolve. We design integrations so that small changes are easier to adapt to and we document key assumptions. If a provider makes a breaking change, we can help update the integration as a new piece of work. For critical systems, we can also suggest ways to monitor for issues.

  • Can you help clean up or replace existing automations?

    Yes. If you already have a tangle of zaps, scripts or legacy integrations, we can review what is there, identify what is still needed and propose a cleaner, more reliable setup. In some cases that means refining existing automations, in others it means replacing them with a better pattern.

  • Will the integration slow down our website?

    Our goal is the opposite. Where possible we design integrations so that heavy work happens off the critical path and does not block page load or basic interactions. If some calls must happen during a user action, we keep them focused and well handled so the impact is minimal and predictable.

  • Do you provide ongoing support for integrations?

    Yes. We can provide light ongoing support to check logs, adjust mappings, respond to provider changes and extend integrations as your processes grow. The exact shape of that support can be agreed based on how often things change in your stack.

Let's make it happen

  • Commercial thinking

    Every decision ties back to the job of the page.

  • Fast, accessible builds

    Performance and usability stay in the build.

  • Reliable delivery

    Clean systems, clear QA and steady communication.

  • Easy to keep improving

    We fit your team, tools and workflow.