Params
array(9) {
  ["first_name"]=>
  string(12) "test user fn"
  ["last_name"]=>
  string(12) "test user ln"
  ["country_iso"]=>
  string(2) "by"
  ["city"]=>
  string(5) "Minsk"
  ["company_name"]=>
  string(10) "Clan Cadet"
  ["phone"]=>
  string(12) "+555 000 000"
  ["email"]=>
  string(19) "clancadet@yandex.ru"
  ["locale"]=>
  string(2) "ru"
  ["activation_link"]=>
  string(61) "https://dev.efrito.com/index.php/protected/register.html&uid="
}

Request
string(272) "{"first_name":"test user fn","last_name":"test user ln","country_iso":"by","city":"Minsk","company_name":"Clan Cadet","phone":"+555 000 000","email":"clancadet@yandex.ru","locale":"ru","activation_link":"https:\/\/dev.efrito.com\/index.php\/protected\/register.html&uid="}"

Response
string(91) "{"error":{"code":4,"description":"wrong params: email_already_exist, login_already_exist"}}"