When we talk about APIs, we’re referring to interfaces or services accessible over the web. Your technical team can use APIs as part of any application from say mobile app or a web application hosted anywhere.
If your technical team wants to build end-to-end application involving data extraction and/or verification from documents involving workflow, business rules, various integrations etc., it needs AI technical expertise for document processing in the form of machine leaning, neural networks and natural language processing, image processing and also domain knowledge to handle all the variations and additional efforts and time to handle the complexities for arrive at deployable solution. Instead of that, you can start using the available APIs in a pay as you go model for document processing.