Hi Shilpa,
first of all, you have to create a session with the server and authenticate with it. All information about session is stored in a cookie file. You'll find an example here:
https://docs.delphix.com/display/DOCS50/API+Cookbook%3A+AuthenticationSecond you have to use the sync api to make a snapshot:
POST /resources/json/delphix/database/{YOUR_DB_CONTAINER_REFERENCE}/sync
{
"type": "OracleSyncParameters"
}
In order to know your db container reference, you could get the database list:
GET /resources/json/delphix/database
You can get all api doc into your browser:
http(s)://[engine_ip]/api
Best Regrads.
Gianpiero