How to use the business lines website API?

Question

API

I have a key, login and password.
I want to get all regions and cities, where should I enter it?
https://dev.dellin.ru/api/auth/login/#_header1

"appkey": "00000000-0000-0000-000000000000",
   "login": "[email protected]",
   "password": "Password1"

https://dev.dellin.ru/api/catalogs/poisk-gorodov/

{  
   "appkey":"00000000-0000-0000-000000000000",
   "cityID":"200555",
   "code":"1000000100000010000000000",
   "q":"мос",
   "limit":10
}