Each API still needs to have its own custom body, with specific mandatory keys and values. The name of the verb is just another key and value ... so how is this

Each API still needs to have its own custom body, with specific mandatory keys and values. The name of the verb is just another key and value ... so how is this different from existing APIs? Not different much. The only addition introduced here is the support for third-party CloudFormation resources. So the same AWS APIs can now be used to directly manipulate third party resources without using CloudFormation at all.