REST is simpler, widely understood, and ideal for straightforward CRUD operations and public APIs. GraphQL excels when you have complex, interconnected data models and multiple frontend clients with different data needs. Many of our projects use both: REST for simple public endpoints, GraphQL for the main application data layer.

We implement OAuth 2.0 with short-lived tokens, enforce HTTPS everywhere, validate and sanitise all inputs, implement rate limiting and DDoS protection, conduct regular penetration tests, and follow OWASP API Security Top 10 guidelines at every step.

We implement tiered rate limiting based on client type and subscription level. Free tiers typically get 100 requests per minute, paid tiers get higher limits. We use token bucket algorithms, provide clear rate limit headers in responses, and offer webhook notifications before limits are reached.

We recommend URL-based versioning (/v1/, /v2/) for public APIs and header-based versioning for internal APIs. We implement deprecation policies with minimum 6-month sunset periods and migration guides so integrators have time to upgrade without service disruption.

Yes. We have certified experience integrating Mada (SADAD), STC Pay, HyperPay, PayTabs, Moyasar, Tamara BNPL, Apple Pay, and Google Pay. All implementations are PCI-DSS compliant with tokenized card storage and 3D Secure authentication.

We set up comprehensive monitoring with Datadog, New Relic, or AWS CloudWatch covering response times, error rates, throughput, and availability. Automated alerts notify your team of anomalies. We also implement distributed tracing for microservice architectures and provide monthly API health reports.