API & Integrations

REST APIs for your own product, and integrations that connect the systems you already pay for. Built so they keep working when the other side changes.

What I build

REST APIs

Versioned endpoints, token or key authentication, rate limiting, consistent error shapes and documentation your frontend developer can actually work from. Built in Laravel or custom PHP depending on what the project needs.

Third-party integrations

Payment processors, CRMs, accounting systems, logistics and shipping providers, email platforms and ecommerce APIs. I have wired GoHighLevel webhooks into a WordPress lead flow for Showtime Pools, and built TaxPilot to a Philippine government DAT file spec where the format had to match exactly.

Webhook handlers

The unglamorous half nobody scopes. Signature verification so you are not accepting forged payloads, idempotency so a retry does not double-charge someone, a queue so a slow downstream call does not time out the sender, and a dead letter path so a failure is recoverable instead of gone.

Data migrations and syncs

Moving records between systems once, or keeping them aligned on a schedule. Field mapping, deduplication and a dry-run mode so you see what would happen before it happens.

What usually goes wrong

Nobody verifies webhook signatures. If your endpoint accepts any POST, anyone who finds the URL can write to your database.

No idempotency. The sender retries, you process twice, and now there are two orders. Every handler I write is safe to call more than once with the same payload.

Secrets in the repository. API keys belong in environment variables, not in a config file that ends up in git history.

No logging. When an integration misbehaves at 3am you need the request and response stored somewhere, or you are debugging blind.

Trusting the other side to stay the same. APIs change fields, deprecate versions and go down. Integrations get built assuming none of that happens.

What this costs

My rate is $10 per hour. Most integrations are a fixed-price build once the endpoints are known. If the third-party documentation is unclear, I scope a short discovery first rather than guessing at a number.

Questions people ask

Can you integrate with a system that has no public API?
Sometimes. Options include a partner API, a data export on a schedule, or a database-level integration if you control both sides. I will tell you honestly if it is not worth doing.

Do you write documentation?
Yes. An undocumented API is a liability the moment someone else has to use it.

Can you fix an integration someone else built?
Yes, and it is a good share of this work. I audit what is there before quoting.

How do you handle authentication?
API keys or tokens with scoped permissions, secrets in environment variables, HTTPS enforced, and rate limiting on public endpoints.

Start a project

Tell me which two systems need to talk to each other, and what should happen when they do.