4.1 EMCD - WEB API for dialers

For security reasons, access to all methods will be secured by the HTTP mechanism, i.e. basic authentication. Additionally, traffic tunneling via SSL will be used. Below is a table with login details.
List of functions supported by the API

Error codes
OK                               = "200";
SMS_SEND                         = "201";
CALLBACK                         = "202";
MAIL_SEND                        = "203";
INVALID_PARAMETER                = "400";
INVALID_PASSWORD                 = "401";
INVALID_PHONE_NUMBER             = "402";
TOO_MANY_REQUESTS                = "403";
INVALID_HTTP_METHOD              = "404";
INVALID_CODE                     = "405";
INVALID_LOGIN_PASSWORD           = "406";
INVALID_CONTENT_TYPE             = "407";
USERNAME_ALREADY_EXIST           = "408";
EMAIL_ALREADY_EXIST              = "409";
INVALID_EMAIL                    = "410";
FILE_TOO_LARGE                   = "411";
TOO_MANY_ATTEMPTS                = "412";
UNEQUAL_VALUE                    = "413";
ERROR_API_WHEN_SENDING_SMS       = "414";
LAST_REMAINING_ATTEMPTS          = "415";
NO_INFO_ABOUT_VERSION            = "416";
INVALID_VERSION                  = "417";
INVALID_USERNAME                 = "418";
INVALID_COUNTRY                  = "419";
INVALID_JSON_FORMAT              = "420";
ERROR_PROVIDER_WHEN_SENDING_SMS  = "421";
ERROR_BLACKLIST_WHEN_SENDING_SMS = "422";
INVALID_AUTHENTICATION_HEADER    = "423";
INVALID_USER_AGENT               = "424";
INVALID_RESOURCE_KEY             = "425";
RECOMMENDATION_ALREADY_EXIST     = "426";
SIP_CLIENT_DOES_NOT_EXIST        = "427";
LOCAL_CONTACT_DOES_NOT_EXIST     = "429";
TRANSACTION_ALREADY_FINALIZED    = "430";
APPLE_REQUEST_FAILED             = "431";
FRAUD_ATTEMPT                    = "432";
INVALID_PRODUCT_ID               = "433";
INVALID_PURCHASE_STATE           = "434";
PURCHASE_CANCELED                = "435";
PHONE_NUMBER_ALREADY_EXIST       = "436";
CLIENT_PASS_ALREADY_EXIST        = "437";
CLIENT_PASS_DOES_NOT_EXIST       = "438";
CLIENT_PASS_MUST_BE_DIFFERENT    = "439";
CLIENT_PASS_DOES_NOT_MATCH       = "440";
PHONE_NUMBER_ALREADY_ASSIGNED    = "441";
NOT_ENOUGH_FUNDS                 = "442";
GROUP_CHAT_TOO_MANY_MEMBERS      = "443";
GROUP_CHAT_DOES_NOT_EXIST        = "444";
CLIENT_IS_NOT_ACTIVE             = "445";
PLAN_ALREADY_ASSIGN              = "446";
PLAN_NOT_AVAILABLE               = "447";
METHOD_DISABLED                  = "448";
INVITE_NOT_ALL_SEND              = "449";
INVITE_SEND_LIMIT                = "450";
TOO_MANY_DEVICES                 = "451";
CLIENT_EMAIL_DOES_NOT_EXIST      = "452";
CONTACT_TOKEN_EXPIRED            = "453";
CONTACT_TOKEN_PENDING            = "454";
INVALID_PIN                      = "455";
GROUP_CHAT_STATUS_ALREADY_SET    = "456";
GROUP_CHAT_STATUS_NOT_CONFIRMED  = "457";
ERROR_BUYING_DID                 = "458";
USERNAME_ALREADY_ASSIGNED        = "459";
INVALID_SIGNIN_TOKEN             = "460";
TARIFF_ALREADY_ASSIGN            = "461";
INTERNAL_ERROR                   = "500";