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Explore Application Programming Interface (API) certification and training courses — delivered live by certified instructors.
An Application Programming Interface (API) is a set of protocols and tools that enables software applications to communicate with each other, exchange data, and share functionality. Published by organizations to standardize interactions between systems, it solves the problem of siloed software by allowing controlled access to services without exposing internal code. In modern architecture, APIs sit between applications and backend systems, acting as intermediaries that process requests and return responses. Common types include Web APIs, which use HTTP to enable internet-based interactions; REST APIs, which follow architectural constraints for scalability and statelessness; SOAP APIs, which rely on XML for structured messaging; GraphQL APIs, which allow clients to query only the data they need; Internal APIs, used within an organization for system integration; and Open APIs, publicly available interfaces like those from social media or payment platforms. This technology is for developers, software architects, and integration specialists who design, build, or connect applications across distributed systems. It enables them to reuse existing services, accelerate development, and ensure interoperability in cloud, microservices, and SaaS environments.
HTTP Methods
Use GET, POST, PUT, DELETE and PATCH according to REST conventions
JSON Handling
Read and write JSON payloads in API requests and responses
REST Concepts
Design resource-based endpoints using URI paths and status codes
OpenAPI Specification
Define API contracts using OpenAPI 3.0 or later in YAML or JSON
Authentication
Implement OAuth 2.0, API keys or JWT for secure access control
CORS Management
Configure cross-origin headers for browser-based client integrations
The building blocks every Application Programming Interface (API) solution is made of
See what your official Application Programming Interface (API) certification looks like. Download a sample — then let our advisors map the fastest path to earning the real one.
IBM-C1000-138IBM API Connect v10.0.3 Solution Implementation
GCP-PCDGoogle Cloud Professional Cloud Developer
MuleSoft-MCDMuleSoft Certified Developer
Postman-API-FundamentalsPostman API Fundamentals Student Expert
IBM-C1000-142IBM Cloud Pak for Integration v2021.4 Administration
Salesforce-CTASalesforce Certified Technical Architect
Official credential badges — shareable on LinkedIn
Four formats. One quality standard. Every option comes with the same expert instructors, official courseware, and money-back guarantee.
Every factor that determines whether you actually pass your Application Programming Interface (API) exam — rated across every training format available.
| Criteria | Koenig | ALP Provider | Legacy Provider | Self-Paced Platform | Free Platform |
|---|---|---|---|---|---|
| Trainer quality and credentials | |||||
| Live instructor-led delivery | |||||
| 1-on-1 private training | Partial | ||||
| No Parent Vendor Authorisation | — | — | — | — | — |
| Flexibility and access | |||||
| Any-day flexi start | |||||
| On-site or fly-me-a-trainer | |||||
| Global delivery reach | Partial | Partial | |||
| Results and trust | |||||
| Entry price fundamentals course | ~$745 · best value | ~$1,500+ | ~$1,500+ | $15-30/mo | Free |
| Verified learner reviews | 18,400+ · 4.9★ | Limited | Limited | Limited | N/A |
Data sourced from public pricing pages and review platforms. Accurate as of March 2026. Partial = available in select regions only.
Verified reviews from learners certified on Azure, AI, Security, and more.
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