The rippled server has a JSON-RPC API which can be called via HTTP. Is there a Postman Collection for this API?
The documentation mentions that Postman can be used, but I haven’t found a collection yet.
You can use any HTTP client (like RESTED for Firefox, Postman for Chrome or Online HTTP client ExtendsClass) to make JSON-RPC calls a rippled server. Most programming languages have a library for making HTTP requests built in.