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GullySystem

Custom API Development for Systems Without Connectors

Custom API development gives in-house applications and older tools a defined interface. Partners, vendors or your own apps can then read and write data under rules you control.

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What a custom API is

It is a defined, guarded doorway into one of your systems. It is built where no packaged connector exists, or where you are the one handing data to somebody else’s app. It replaces emailed spreadsheets, one-off scripts and open database logins with a fixed set of requests that return only what the caller may see.

When a custom build is needed

  • Your core application was written for you and publishes nothing
  • A dealer or franchise app needs your stock and rate list without touching the database
  • A weighing scale, kiosk or field device has to post readings into the office system
  • An auditor needs read-only sight of specific records, not the whole system
  • A manual export has become the way two systems talk, and it breaks often

What goes into the build

Endpoint design

Resources, methods and responses are defined around what the calling system needs, not copied from a template.

Authentication and scope

Every caller gets its own credentials, limited to the data and actions it is permitted. One dealer cannot read another dealer’s records.

Versioning from the first release

Endpoints carry a version, so a change made later does not break an integration that nobody remembers commissioning.

Rate limits, logs and handover

Calls are capped and recorded. You receive written documentation, a test environment and credentials issued in your own name.

FAQ

Frequently asked questions

Do we need a custom API if our software already has one?

No. Where your ERP, CRM or store platform already publishes an API, the build uses that and does not duplicate it. Custom work covers what is missing.

Who can call the API once it exists?

Only whoever you issue credentials to. Each key is scoped to particular endpoints and actions, so a partner can see stock levels without seeing pricing, orders or customer data.

Where does the API run?

On infrastructure in your name, such as your own cloud account or server. We can set it up and look after it, and you keep control of it.

Can the API change as our systems change?

Yes. Because it is versioned and documented, endpoints can be added or adjusted without breaking existing callers, provided later changes keep the same discipline.

Talk to us

Tell us what you need.

Share your requirements and one of our engineers will come back to you within one business day.

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  • A reply within one business day
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