Here’s how to proceed:

1

Get my API keys

If you don’t already have your API keys, follow the steps in the section Get my API keys

2

Discover the API

Check out the detailed documentation of the API post applicants. It will also be useful to understand the concept of Custom fields

3

Get inspired by integration examples

Don’t worry, you’re not the first one, and you’ll probably find examples of integrations below that are similar to what you want.