TLDR
API APIs can be as simple as 1 endpoint for use by 100s of users or as complex as the AWS APIs with 1000s of endpoints and thousands of users. Building them can mean spending a couple of hours using a low-code platform or months of work using a multitude of tools. REST is the most popular API interface and has the best tooling. Business logic is typically the glue between all the external services and is commonly used to enable:Triggering messages such as email and push notifications on developer-defined changes in the data store.via the TL;DR App
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