Hi@Nerijusz, 

Welcome to the Community!

Are you looking to receive consent for email or SMS? We have some helpful documentation sharing how to get SMS consent via API in our Help center that even shares a json example! Essentially, the code will look something like this:

import requests
import json
data = {
   "api_key": "PRIVATE_API_KEY",
   "profiles": e
       {
           "phone_number": "+12345678900",
           "sms_consent": True
       }
   ]
}
headers = {
   "Content-Type": "application/json",
   "Cache-Control": "no-cache"
   }
conv = json.dumps(data)
response = requests.request("POST", "https://a.klaviyo.com/api/v2/list/{LIST_ID}/subscribe", data=conv, headers=headers)
print(response.text)

Hope this helps!

-Taylor