Survilla platform uses GraphQL to access the API. GraphQL brings improvements in the form of greater clarity and strict types. There are a lot of GraphQL client libraries for almost every programing language. Link: https://graphql.org/code/#language-support
GraphQL uses two types of operations. Query operations are used to read data. Mutations are used to change data. Individual query and mutation operations are sent in the POST endpoint request.
Each provider has its own URL.
GraphQL endpoint:
https://provider_URL/api/graphql.php
More about GraphQL is here https://graphql.org/learn/ .