如何检查API的实际功能以及如何使用我的网站配置API

I have API key and network id which is running on Hasoffer platform and provided by my Vcommisson.com (My affiliate company)

Please tell me how can I check actual functionalities of the API. Actually I wanted to update coupons and deals automatically on my website with help of API of vcommission. How can I configure API with my website which is under development on wordpress platform.

Please help me and if possible then please share any images in the answer.

1 open chrome browser. 
2 install apps    (https://chrome.google.com/webstore/search/rest%20client?utm_source=chrome-ntp-icon) 
3 open this apps and use