In 2025, key API integration types will include RESTful APIs for their simplicity and efficiency, GraphQL APIs for targeted data retrieval, and SOAP APIs for secure, formal communication in sensitive industries. Additional trends will involve WebSocket APIs for real-time interaction, OAuth 2.0 for secure user authorization, and Payment Gateway APIs for handling online transactions. Overall, the integration of IoT APIs and the rise of various integration tools will remain essential for businesses adapting to digital transformations.