diff --git a/yamd b/yamd
index 0e598bd..426cb4e 100755
--- a/yamd
+++ b/yamd
@@ -46,104 +46,178 @@ use LWP::UserAgent;
 use HTTP::Request;
 
 our $api_url = "https://pddimp.yandex.ru/api2/admin";
-our $query_options = Load(<<EOYAML
+our $api_requests = Load(<<EOYAML
 ---
 default_content_type: 'application/x-www-form-urlencoded'
 deputy:
   list:
     query_type: 'GET'
+    parameters:
+      required: [domain]
   add:
     query_type: 'POST'
+    parameters:
+      required: [domain, login]
   delete:
     query_type: 'POST'
+    parameters:
+      required: [domain, login]
 
 dkim:
   status:
     query_type: 'GET'
+    parameters:
+      required: [domain]
   disable:
     query_type: 'POST'
+    parameters:
+      required: [domain]
   enable:
     query_type: 'POST'
+    parameters:
+      required: [domain]
 
 dns:
   list:
     query_type: 'GET'
+    parameters:
+      required: [domain]
   add:
     query_type: 'POST'
+    parameters:
+      required: [domain, type, content]
   del:
     query_type: 'POST'
+    parameters:
+      required: [domain, record_id]
   edit:
     query_type: 'POST'
+    parameters:
+      required: [domain, record_id]
 
 domain:
   details:
     query_type: 'GET'
+    parameters:
+      required: [domain]
   domains:
     query_type: 'GET'
   registration_status:
     query_type: 'GET'
+    parameters:
+      required: [domain]
   delete:
     query_type: 'POST'
+    parameters:
+      required: [domain]
   register:
     query_type: 'POST'
+    parameters:
+      required: [domain]
 
   logo:
     check:
       query_type: 'GET'
+      parameters:
+        required: [domain]
     del:
       query_type: 'POST'
+      parameters:
+        required: [domain]
     set:
       content_type: 'multipart/form-data'
       query_type: 'POST'
+      parameters:
+        required: [domain, file]
 
   settings:
     set_country:
       query_type: 'POST'
+      parameters:
+        required: [domain, country]
 
 email:
   counters:
     query_type: 'GET'
+    parameters:
+      required: [domain, login]
   list:
     query_type: 'GET'
+    parameters:
+      required: [domain]
   add:
     query_type: 'POST'
+    parameters:
+      required: [domain, login, password]
   del:
     query_type: 'POST'
+    parameters:
+      required: [domain, login]
   edit:
     query_type: 'POST'
+    parameters:
+      required: [domain, login]
   get_oauth_token:
     query_type: 'POST'
+    parameters:
+      required: [domain, login]
 
   ml:
     list:
       query_type: 'GET'
+      parameters:
+        required: [domain]
     subscribers:
       query_type: 'GET'
+      parameters:
+        required: [domain, maillist]
     add:
       query_type: 'POST'
+      parameters:
+        required: [domain, maillist]
     del:
       query_type: 'POST'
+      parameters:
+        required: [domain, maillist]
     get_can_send_on_behalf:
       query_type: 'POST'
+      parameters:
+        required: [domain, maillist, subscriber]
     set_can_send_on_behalf:
       query_type: 'POST'
+      parameters:
+        required: [domain, maillist, subscriber, can_send_on_behalf]
     subscribe:
       query_type: 'POST'
+      parameters:
+        required: [domain, maillist, subscriber]
     unsubscribe:
       query_type: 'POST'
+      parameters:
+        required: [domain, maillist, subscriber]
 
 import:
   check_imports:
     query_type: 'GET'
+    parameters:
+      required: [domain]
   check_settings:
     query_type: 'GET'
+    parameters:
+      required: [domain, server, port, method, ssl]
   start_import_file:
     content_type: 'multipart/form-data'
     query_type: 'POST'
+    parameters:
+      required: [domain, file, server, port, method, ssl]
   start_one_import:
     query_type: 'POST'
+    parameters:
+      required: [domain, server, port, method, ssl, ext-login, ext-password]
   stop_all_imports:
     query_type: 'POST'
+    parameters:
+      required: [domain]
 EOYAML
 );
 
@@ -165,51 +239,96 @@ our $task = undef;
 	}
 }
 
-foreach my $check ("domain", "token", "service", "query") {
+# Checking general mandatory parameters of the request
+foreach my $check ("query", "service", "token") {
 	if (!defined $task->{$check}) {
-		die "'$check' is undefined in '$task_file'\n";
+		die "'" . $check . "' is undefined in '" . $task_file . "'\n";
+	} else {
+		if (!ref($task->{$check})) {
+			if ($task->{$check} =~ /^-?\d+\.?\d*/) {
+				die "Incorrect value of '" . $check . "' in '" . $task_file . "'\n";
+			}
+		} else {
+			die "Incorrect value of '" . $check . "' in '" . $task_file . "'\n";
+		}
 	}
 }
 
 my $request_url = "";
 my $request_type = "";
 my $request_content_type = "";
+my $service = $task->{service};
+my $sub_service = $task->{sub_service};
+my $query = $task->{query};
+my $options = $task->{options};
+my $api_request = undef;
+my @check_list;
+
+# Checking mandatory parameters of the request
+if (defined $sub_service) {
+	$api_request = $api_requests->{$service}->{$sub_service}->{$query};
+} else {
+	$api_request = $api_requests->{$service}->{$query};
+}
 
-{
-	my $service = $task->{service};
-	my $sub_service = $task->{sub_service};
-	my $query = $task->{query};
-
-	$request_url = $api_url . "/" . $service;
-	$request_url .= (defined $sub_service) ? "/" . $sub_service : "";
-	$request_url .= "/" . $query;
+if (defined $api_request->{parameters}->{required}) {
+	@check_list = @{$api_request->{parameters}->{required}};
+}
 
-	if ( $service eq "import" && $query eq "start_import_file" ) {
-		$request_url .= "?domain=" . $task->{domain};
-		foreach my $k (keys %{$task->{options}}) {
-			$request_url .= "&" . $k . "=" . $task->{options}->{$k};
+foreach my $check (@check_list) {
+	if (defined $task->{$check}) {
+		if (!ref($task->{$check})) {
+			if ($task->{$check} =~ /^-?\d+\.?\d*/) {
+				die "Incorrect value of '" . $check . "' in '" . $task_file . "'\n";
+			}
+		} else {
+			die "Incorrect value of '" . $check . "' in '" . $task_file . "'\n";
+		}
+	} elsif (defined $options->{$check}) {
+		if (!ref($options->{$check})) {
+			if ($options->{$check} =~ /^-?\d+\.?\d*/) {
+				die "Incorrect value of '" . $check . "' in '" . $task_file . "'\n";
+			}
+		} else {
+			die "Incorrect value of '" . $check . "' in '" . $task_file . "'\n";
 		}
-	}
-
-	if (defined $sub_service) {
-		$request_type = $query_options->{$service}->{$sub_service}->{$query}->{query_type};
-		$request_content_type = $query_options->{$service}->{$sub_service}->{$query}->{content_type};
 	} else {
-		$request_type = $query_options->{$service}->{$query}->{query_type};
-		$request_content_type = $query_options->{$service}->{$query}->{content_type};
+		die "'" . $check . "' is undefined in '" . $task_file . "'\n";
 	}
+}
+
+$request_url = $api_url . "/" . $service;
+$request_url .= (defined $sub_service) ? "/" . $sub_service : "";
+$request_url .= "/" . $query;
 
-	if (!defined $request_content_type) {
-		$request_content_type = $query_options->{default_content_type};
+if ( $service eq "import" && $query eq "start_import_file" ) {
+	$request_url .= "?domain=" . $task->{domain};
+	foreach my $k (keys %{$task->{options}}) {
+		$request_url .= "&" . $k . "=" . $task->{options}->{$k};
 	}
 }
 
+if (defined $sub_service) {
+	$request_type = $api_request->{query_type};
+	$request_content_type = $api_request->{content_type};
+} else {
+	$request_type = $api_request->{query_type};
+	$request_content_type = $api_request->{content_type};
+}
+
+if (!defined $request_content_type) {
+	$request_content_type = $api_requests->{default_content_type};
+}
+if (!defined $sub_service) {
+	$sub_service = "";
+}
+
 my $ua = new LWP::UserAgent;
 my $request = new HTTP::Request($request_type => $request_url);
 
-if ( $task->{service} eq "domain" &&
-	$task->{sub_service} eq "logo" &&
-	$task->{query} eq "set" ) {
+if ( $service eq "domain" &&
+	$sub_service eq "logo" &&
+	$query eq "set" ) {
 	{
 		my $boundary = 'X';
 		my @rand = ('a'..'z', 'A'..'Z');
@@ -266,7 +385,11 @@ if ( $task->{service} eq "domain" &&
 			'Content-type' => $request_content_type
 		);
 
-		my $request_content = "domain=" . $task->{domain};
+		my $request_content = "";
+		if (defined $task->{domain}) {
+			$request_content = "domain=" . $task->{domain};
+		}
+
 		foreach my $k (keys %{$task->{options}}) {
 			$request_content .= "&" . $k . "=";
 			$request_content .= encode("utf8",$task->{options}->{$k});