Our documentation is here to present all the methods the API offer. If you have issues understanding the documentation, we suggest you read the article designed to help you grasp and use it to its full potential.
You can access it here. We refer to the doc frequently in the Knowledge Base. Mentions of methods and objects are followed with links to the relevant documentation section using this format: the sms.send method (doc).
What are SDKs and what are they useful for?
SDKs are here to present concrete API implementation in the programming language you are familiar with. They systematically include example allowing you to see how to use the API methods in each language.