An HTTP-based API is not necessarily a REST API. Describing an API that uses only POST, or GET and POST, as a REST API shows total ignorance of what Roy Fielding meant when he first described Representation State Transfer over 20 years ago.

REST is a clean and elegant way to connect resources over a network. It is well worth the time to learn, understand, and use.

https://medium.com/nerd-for-tech/designing-a-rest-api-3a070398750f