API Development & Integration Services in Haslet, Texas - App Basis Inc
App Basis Inc provides custom API development and third-party integration services for businesses in Haslet, Texas and across the Dallas-Fort Worth area. Modern businesses run on software - and that software is only as useful as its ability to communicate with the other systems in your operation. When your CRM does not know what your e-commerce platform is doing, when your field service app cannot talk to your accounting software, when your scheduling tool does not connect to your billing system - your team fills the gap manually, with all the time cost and error risk that entails. We eliminate that gap by building the connections that make your software ecosystem function as a unified whole.
An API (Application Programming Interface) is the technical mechanism through which software systems exchange data and trigger actions across system boundaries. When your accounting software creates an invoice automatically the moment a job is completed in your field service app, when new customer records flow into your CRM the instant a form is submitted on your website, when an order in your e-commerce platform instantly creates a fulfillment record in your warehouse system - these outcomes are delivered by API integrations working in the background. The business value is immediate and ongoing: eliminated manual steps, eliminated errors, and processes that run faster and more reliably than any human-driven workflow can match.
App Basis Inc has built API integrations and custom APIs for businesses throughout Haslet, Fort Worth, and the DFW area across a wide range of industries - field service companies, retail and e-commerce businesses, healthcare providers, professional services firms, and technology startups. We approach API work with the same discipline we bring to all our development: understanding the business need first, designing the integration architecture to solve it cleanly, and building with security, reliability, and maintainability as non-negotiable requirements.
Custom API Development
When your business needs a custom API - for a new web application, a mobile app, a SaaS product, or a platform that needs to expose data and functionality to external systems - we design and build it with the standards that professional API development demands. A well-designed API is one of the most durable assets in your software infrastructure. It defines how your systems talk to each other, how your mobile apps access your data, and how third-party partners and customers can build on top of your platform. Getting it right matters for the long term.
We build RESTful APIs as our default for most web and mobile applications - the architectural style that balances simplicity, broad tooling support, and clear conventions for most use cases. We build GraphQL APIs for applications where flexible, efficient data fetching is important - particularly for frontend-heavy applications where multiple views need different subsets of the same underlying data, and for platforms with complex relationship graphs that benefit from client-specified query structures. We use JSON:API or custom conventions depending on the project requirements and the client team's preferences.
Every custom API we build includes comprehensive documentation - either generated automatically from OpenAPI specifications or written manually for clarity - so that your team and future developers understand how to use and extend the API without guesswork. Documentation is not optional; it is a deliverable that we treat with the same care as the code itself. An undocumented API is a liability that accumulates knowledge debt with every developer who has to read the source code to understand what it does.
Third-Party Integration Services
The landscape of third-party software integrations is vast, and experience with the specific APIs matters. Each platform has its own authentication model, rate limiting behavior, webhook delivery characteristics, data model conventions, and quirks that are only discovered through real implementation work. We have built integrations with dozens of the most commonly used business platforms and bring that experience directly to your project.
QuickBooks Online and QuickBooks Desktop integration connects your business operations to your accounting platform - syncing invoices, payments, customers, and inventory without manual data entry. Salesforce and HubSpot CRM integrations ensure that customer and lead data flows automatically from your website, mobile app, and other touch points into your sales system. Stripe, Square, and PayPal integrations handle payment processing, subscription billing, and transaction data. Twilio integrations power SMS and voice communications triggered by your application logic. Google Workspace and Microsoft 365 integrations connect scheduling, document management, and communication to your business applications. ShipStation, ShipBob, and other fulfillment platform integrations automate order routing and shipping. The list extends to hundreds of other platforms - if it has an API, we can connect to it.
Webhook-Based Event-Driven Integrations
Many of the most valuable integrations operate in real time - one system notifies another the moment something happens, so the dependent process can proceed immediately rather than waiting for a scheduled data sync. Webhooks are the mechanism that makes this possible. When Stripe processes a payment, it sends a webhook to your application that can trigger immediate order fulfillment. When a customer submits a form on your website, the webhook fires immediately to create a CRM record, send a notification to your sales team, and trigger an automated email sequence - all within seconds.
Webhook integration requires careful attention to reliability. Webhook delivery is not guaranteed - network failures, server downtime, and rate limiting can cause missed events. We build webhook receivers with idempotency (the ability to handle duplicate deliveries safely), proper signature verification to authenticate that events come from the expected source, and dead letter queues that capture failed deliveries for retry and investigation. A webhook integration that silently drops events under load is worse than no integration, because it creates inconsistency that is difficult to detect and harder to reconcile.
API Security
APIs are a significant attack surface in modern software systems. An API that is not properly secured is an open door to your business data - and in the DFW market, that data includes your customers' personal information, financial records, and business intelligence. We implement API security as a non-negotiable requirement of every API we build, not a feature added at the end.
Authentication is the foundation. We implement OAuth 2.0 for user-delegated access flows, API keys with rotation capability for machine-to-machine integrations, and JWT (JSON Web Token) based authentication for stateless API access - each appropriate to different access patterns. Rate limiting prevents abuse and protects your system from both malicious actors and runaway client applications that consume resources uncontrolled. Input validation at every endpoint ensures that unexpected or malicious data does not reach your business logic or database. Role-based access control ensures that API consumers can only access the data and operations that their authorization level permits. HTTPS is enforced for all API traffic without exception.
Legacy System Integration
Not every system your business depends on has a well-documented modern API. Legacy applications built before API-first development was standard - older ERP systems, custom-built internal platforms, vendor systems with limited integration capability - often cannot be connected through standard API methods. For businesses in the DFW area whose operations depend on legacy systems that need to communicate with modern platforms, we build custom integration layers that bridge the gap.
These solutions take different forms depending on what the legacy system exposes: database-level integrations that read and write directly to the underlying data store when API access is not available, file-based integrations that process data exports on a schedule, screen scraping for systems where no structured data access exists, and middleware layers that translate between legacy data formats and modern API standards. These are not ideal architectures - the right long-term solution is often to replace the legacy system - but as interim solutions for businesses whose operations cannot pause for a full replacement, they work reliably when built carefully.
API Monitoring and Reliability
An API integration that breaks silently is an operational liability. When your CRM stops receiving new lead data, when invoices stop syncing to QuickBooks, when order fulfillment stops routing to your warehouse system - these failures have immediate business consequences. We build monitoring into every integration we deliver, with alerting that notifies your team when an integration fails or exhibits unexpected behavior, before the business impact accumulates.
We use a combination of application-level logging that captures every API call and its outcome, error tracking tools that aggregate failures and identify patterns, and health check endpoints that external monitoring services poll to verify integration health. For high-value integrations where failure has significant cost, we implement circuit breakers that detect cascading failures and prevent them from propagating through your system.
Serving Haslet and the DFW Area
App Basis Inc builds custom APIs and third-party integrations for businesses throughout Haslet, Fort Worth, Keller, Roanoke, Saginaw, and across the Dallas-Fort Worth metroplex. Whether you need to connect existing systems that should have been talking to each other years ago, build the API layer for a new application, or expose your platform's capabilities to partners and customers - we deliver the integration work that keeps your software ecosystem running as a unified whole. Contact us for a free consultation.