We design and build the APIs and integrations that connect your stack — documented, versioned, and resilient when a dependency goes down.
Every business now runs on a stack: an ecommerce platform, a payment gateway, a CRM, accounting software, a shipping provider, maybe an ERP and a few internal tools. Each one is decent on its own. The trouble starts where they meet. Orders don't reach the warehouse, payments don't reconcile, and customer records exist in four versions. API integration engineering is the work of connecting these systems so data moves correctly, once, and on time, with someone alerted when it doesn't. Done properly, nobody notices it.
Most integrations break in the same few ways. They assume the other system is always up. They retry a payment call and charge the customer twice. They have no logs, so nobody can tell whether an order was sent. We design for those failures from the start: idempotent requests, queues and retries with backoff, dead-letter handling for messages that can't be processed, and dashboards that show what moved and what got stuck. When we design your own APIs, we write the contract first, version it properly and generate documentation that developers outside your company can actually use.
We have been integrating systems for clients since 2020, from payment gateways and courier APIs in Pakistan and the Gulf to CRMs, ERPs and marketplaces used in the UK and US. Our order processing work for BnW Collections, for instance, depended on stitching together ordering, inventory and fulfillment cleanly. Some projects are a single connector. Others are a full integration layer that several products depend on. Either way you get code you own, documentation you can hand to another team and monitoring that tells you about a problem before your customers do.
A map of your systems, data flows, and where they currently break.
API & Integration EngineeringContract-first design, versioning strategy, and documentation from day one.
API & Integration EngineeringAPIs and connectors built with retries, idempotency, and clear error handling.
API & Integration EngineeringPayment, logistics, CRM, and partner systems wired in properly.
API & Integration EngineeringRate limiting, authentication, monitoring, and failure alerting.
API & Integration EngineeringOngoing support as dependencies and requirements change.
Stripe, PayPal, Checkout.com, PayTabs, HyperPay, Tap and local gateways connected with webhooks, refunds, subscriptions and reconciliation. We handle the failure cases that cause duplicate charges or orders stuck in pending.
Two-way sync between your operational systems and SAP, Oracle NetSuite, Odoo, Microsoft Dynamics, Xero, QuickBooks or Zoho. Orders, invoices, stock and customers stay consistent without manual exports.
Shopify, WooCommerce, Salla, Zid, Amazon and Noon connected to your inventory, fulfillment and finance systems. Stock levels and order statuses update in near real time across every channel.
Shipment creation, label printing, tracking and cash-on-delivery reconciliation with courier and 3PL providers. Customers get accurate status updates and your team stops copying tracking numbers by hand.
REST or GraphQL APIs that let partners, customers or your own mobile apps access your platform. They include authentication, rate limits, versioning and OpenAPI documentation from day one.
WhatsApp Business API, SMS, email providers, HubSpot, Salesforce and AI model APIs connected into your workflows. This is the plumbing behind our AI voice agent and support assistant products.
Retries, idempotency keys, queues and timeouts are standard in every integration we build. A partner API going down for an hour should delay data, not lose it or duplicate it.
We agree the API contract before implementation, so frontend, mobile and partner teams can work in parallel. Versioning rules are set early, which means you can change the API without breaking existing clients.
Structured logs, monitoring and alerting show what was sent, what came back and what failed. When a customer asks where their order is, your team can find the answer in minutes.
We have worked with payment, courier and commerce platforms common in Pakistan, Saudi Arabia and the UAE, as well as global ones. Local APIs often have quirks that are only documented in someone's experience. We plan around those quirks instead of discovering them in production.
Storefront, marketplace, inventory, payment and courier systems connected so orders flow from checkout to delivery without manual steps.
Payment rails, KYC providers, open banking APIs and core banking connections built with strict security, signing and full request logging.
Carrier, telematics and booking APIs integrated so dispatch, tracking and billing share the same live data across partners.
Booking engines, channel managers, GDS feeds and property management systems connected with careful handling of availability and rate changes.
Practice management, lab, insurance and messaging systems linked using HL7 or FHIR where available, with access controls on every patient record.
Public APIs, webhooks and prebuilt integrations that make your product easier to adopt and harder for customers to leave. Clear docs and a sandbox cut the support load from integrators.
Tell us what you are trying to build. You will get an honest take on scope, timeline and cost, usually within one business day.
Softzee built a scalable platform that makes it easy to discover venues, book wellness services, and check in across Pakistan’s growing fitness network.
Softzee designed a two-sided booking platform that makes it easy for passengers to schedule rides and for drivers to manage trips, updates, and completions in one seamless workflow.
Our team has expertise in 100+ technologies and programming languages, including the AI coding tools rewriting how software gets built.
Still have a question? Ask us directly and a senior engineer will reply.
A single integration with a well-documented API, such as a payment gateway or courier, typically costs between $3,000 and $12,000. Two-way ERP sync or multi-system integration layers usually land between $15,000 and $50,000. Cost depends on the quality of the third-party API, the volume of data, how many edge cases exist and whether you need monitoring dashboards and admin tools. Poorly documented or legacy systems take longer and cost more.
A straightforward connector to a modern API is usually built and tested in two to four weeks. Complex ERP or multi-party integrations take two to four months, often because sandbox access, partner approvals and test data take longer than the code. We start the paperwork and credential requests early so they don't hold up the build.
API development means building your own API so other systems, apps or partners can use your data and functions. API integration means connecting your systems to someone else's API, such as a payment gateway, CRM or ERP. Most projects involve both. For example, a mobile app needs a custom API, and that API often needs to integrate with payment and messaging providers behind the scenes.
REST is the right default for most public and partner APIs because it is widely understood and easy to cache and secure. GraphQL works well when several front ends need flexible access to complex related data. Webhooks are used to push events, such as a payment succeeding, instead of polling. Many systems use all three. We choose based on who consumes the API and how often data changes.
We use OAuth 2.0 or signed API keys, store secrets in a dedicated vault, verify webhook signatures and encrypt data in transit. Access is scoped to the minimum each integration needs. All requests are logged without storing sensitive fields like full card numbers. For payment work we keep card data with the gateway so your systems stay outside the heaviest PCI DSS scope.
Our integrations queue messages and retry automatically when a provider is unavailable, so short outages delay data rather than lose it. Alerts notify your team or ours when failures pass a threshold. When a provider announces a version change, our maintenance plans cover updating the integration before the old version is retired.
Often, yes. Options include direct database access, scheduled file exchange over SFTP, email parsing or, as a last resort, browser automation. These approaches need more monitoring than a proper API, so we are upfront about the trade-offs. Sometimes the better answer is to wrap the old system with a small API layer that other tools can use cleanly.
Tell us about your idea and we'll map out the path forward — or grab a slot and talk it through with us directly.
Book a 15min call"We're always drawn to projects that challenge us, spark creativity, and let us do our best work. Let's build something exceptional together."