Third Party API Integration Services

Connect your software to the tools your business already depends on.

Your platform should not exist in isolation. We wire your application to payment processors, communication services, shipping carriers, CRMs, and whatever else your workflow requires. Every integration is built to handle errors gracefully, not just the happy path.

REST API Laravel Node.js PHP MySQL Stripe PayPal Twilio

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Trusted by companies across the USA

The SIR Group

Third Party API Integration for Your Business

A healthcare staffing company we worked with had a fully functional web portal, but their team was manually copying shift confirmations into a separate SMS tool every morning. The actual fix was a single Twilio integration. What had been a 90-minute daily task became automatic, and response rates from field staff improved because the messages went out within seconds of a confirmation instead of hours later.

That is what third party API integration actually looks like in practice. It is rarely glamorous, but it is almost always the highest-leverage thing you can do to a system that is already working. Whether you need Stripe to process subscription billing, PayPal as a checkout fallback, a shipping carrier to generate real-time rates, or a CRM to receive form submissions automatically, the goal is the same: your software talks to other software so your team does not have to.

We have been doing this work since 2015 across more than 500 projects. Our stack for integration work typically involves REST APIs, Laravel or Node.js depending on what your backend already runs, and MySQL for logging and reconciliation. One honest limitation worth knowing upfront: not every third party API is well-documented or stable. Some providers have rate limits, inconsistent error codes, or deprecated endpoints they have not removed yet. We always build a wrapper layer around external APIs so that when a provider changes something, you swap one file instead of hunting through your entire codebase.

Why Choose Third Party API Integration

Same-Day Automation for Repetitive Tasks

Many integrations we scope turn out to be smaller than clients expect. A Stripe webhook that triggers an invoice email, for example, can go from requirement to production in under a week.

Fixed Price, No Billing Surprises

Every integration project is scoped and priced before we write a single line of code. You know the number before you commit, and that number does not change unless you change the scope.

Error Handling That Actually Works

We log every failed API call, build retry logic for transient failures, and set up alerts so you know about a broken integration before your customers do.

APIs Chosen for Your Stack, Not Ours

If your backend is already running PHP and Laravel, we build the integration there rather than introducing a new language. Fewer moving parts means fewer things that can break.

You Own Every Line of Code

All code, credentials architecture, and documentation belong to you at the end of the project. We sign an NDA on day one and transfer full IP on delivery.

Built to Add More Later

We structure integration layers so adding a second or third API later does not require rewriting the first one. This saves real money when your needs grow.

Our Third Party API Integration Services

Payment Gateway Integration

We connect your platform to Stripe or PayPal for one-time purchases, recurring subscriptions, refunds, and webhook-driven order fulfillment. Includes sandbox testing before any live transactions.

SMS and Voice Integration

Twilio integrations for appointment reminders, OTP verification, order notifications, and two-way SMS workflows. We handle carrier delivery receipts and failed-message fallback logic.

CRM and Marketing Platform Sync

Push form submissions, user signups, or purchase events directly into Salesforce, HubSpot, Mailchimp, or your CRM of choice. No more manual CSV imports.

Shipping and Logistics APIs

Integrate with FedEx, UPS, USPS, or EasyPost to pull real-time shipping rates, generate labels programmatically, and send tracking updates to your customers automatically.

Data Sync Between Internal Systems

If you have two platforms that should share the same data but do not, we build the bridge. This includes ERP-to-CRM sync, inventory system updates, and multi-location database reconciliation.

Custom REST API Development

Sometimes the integration you need does not have a pre-built library. We design and build custom REST API endpoints in Node.js or Laravel so your systems can communicate on your terms.

How We Deliver Third Party API Integration Projects

No 47-slide proposal deck. No three-month discovery phase. Here is how a project moves from your idea to working software.

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1

Discovery & Planning

We spend the first few calls mapping exactly what data needs to move, in which direction, and what triggers the exchange. We review the third party API documentation together and flag any known limitations, rate limits, or authentication quirks before writing a proposal.

2

UI/UX Design

For integrations that involve a user-facing component (a payment form, a tracking widget, an SMS opt-in flow), we design the interface before building the backend. Getting the interaction right on paper is faster than rebuilding it after the API is already wired up.

3

Development

We build in sandbox or test mode first, using the provider's staging environment to validate every call and every edge case. The integration wrapper is written so the core API credentials and retry logic are isolated from your main application code.

4

Testing & QA

We test successful responses, timeout scenarios, invalid credentials, rate limit responses, and webhook delivery failures. You review a recorded walkthrough of the integration before we move anything to production.

5

Launch

We flip the integration to live credentials during a low-traffic window and monitor the first real transactions or events together with you. We stay available for the 48 hours after go-live.

6

Support & Growth

After launch, we provide 30 days of included bug fixes for anything directly tied to the integration. Beyond that, we offer monthly retainer support that covers API version updates, provider deprecation notices, and expanding the integration as your needs change.

Why Choose Aneri Developers

Your Progress While You Sleep

Our team is based in Gandhinagar, India. That means when you log off on a Tuesday evening after sending your notes, we are already working on them. You come back Wednesday morning to a Loom walkthrough of what was built.

Same Engineers, Start to Finish

The developer who reads your API documentation on day one is the same person who writes the production code and answers your questions after launch. No handoffs to a QA team you have never spoken to.

Operating Since 2015

We have been doing this work for over 11 years, across more than 500 projects for clients in 20+ countries. API landscapes change, providers get acquired, documentation gets outdated, and we have navigated all of it.

Communication That Does Not Disappear

You get a dedicated project manager who is reachable during US Eastern and Pacific business hours. We use Slack for quick questions, Zoom for weekly calls, and Loom for async walkthroughs so nothing gets buried in a 12-hour time gap.

Small Team, Real Accountability

We are a focused team of about 10 people. That means the person you talk to in the scoping call is not passing your project to a junior developer across a 50-person org. You always know who is working on your project.

NDA and Full IP Transfer on Day One

We sign a non-disclosure agreement before any technical discussion begins. Every credential, every line of integration code, and every API wrapper we write becomes yours at project close.

Frequently Asked Questions

Common questions about third party api integration.

Stripe and PayPal for payments, Twilio for SMS and voice, shipping carriers like FedEx and EasyPost, CRMs including HubSpot and Salesforce, and various internal REST APIs built on Laravel or Node.js. If you are working with a provider not on that list, we review their documentation during scoping and tell you honestly if there are any red flags before we price the project.

This is actually one of the more common reasons clients come back to us after a project. We build every integration behind a wrapper layer, which means a provider's endpoint change touches one file in your codebase, not dozens. If you are on a support retainer, we handle deprecation updates as part of that. If not, it is a straightforward scoped fix.

Fixed price, always. We scope the integration during discovery, document exactly what gets built, and give you a number before any code is written. Hourly billing on integration work gets unpredictable fast, especially when a third party provider has undocumented behavior. A fixed scope protects you from that.

Simple integrations (a single Stripe webhook, a Twilio SMS trigger, a CRM form sync) typically take one to three weeks from kickoff to production. More complex work involving bidirectional data sync, multiple providers, or custom error handling can run four to eight weeks. We give you a specific estimate after the discovery call, not before it.

Yes, with a caveat. We work through underdocumented APIs regularly, but it takes longer and sometimes requires testing edge cases that the provider never thought to document. We flag this during scoping and build extra time into the estimate when the API is unfamiliar or known to be inconsistent.

Both. If you have an existing Laravel or Node.js application, we slot the integration into your current architecture. If you are starting fresh, we build the backend alongside the integration. Either way, the approach and the ownership terms are the same.

We never store raw card data. Stripe and PayPal handle tokenization on their end, and our code only ever touches the token. We follow each provider's security best practices, use HTTPS for all webhook endpoints, and validate webhook signatures to confirm the payload actually came from the provider.

You send requirements, questions, or feedback at any point during your day. Your project manager reviews everything during their working hours (which overlap partially with US morning hours), and you typically have a response or a Loom update before your afternoon. We use Slack as the primary channel and schedule Zoom calls weekly or as needed. Most clients tell us the async rhythm works better than they expected.

Tell us what needs to connect

Share your current setup and which APIs you need integrated. We will review it and come back with a clear scope and a fixed price, before any commitment on your end.

Free Consultation
No Commitment
NDA on Day One

Describe Your Project

Include as much detail as you want. We typically reply within 24 hours.

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