Usage:
add_action( 'arm_after_common_messages_settings_html', 'your_function' );
function your_function($common_messages) {
    echo "Your options HTML.";
}
Parameters:
$common_messages
Array of Common Messages
Usage:
add_action( 'arm_after_page_settings_html', 'your_function' );
function your_function($page_settings) {
    echo "Your options HTML.";
}
Parameters:
$page_settings
Array of Page Settings
Usage:
add_action( 'arm_after_global_settings_html', 'your_function' );
function your_function($general_settings) {
    echo "Your options HTML.";
}
Parameters:
$general_settings
Array of General Settings
Usage:
add_action( 'arm_before_global_settings_html', 'your_function' );
function your_function($general_settings) {
    echo "Your options HTML.";
}
Parameters:
$general_settings
Array of general Settings
Usage:
add_filter( 'arm_available_currencies', 'your_function');
function your_function($currencies) {
    //$currencies Array of currencies
    $currencies['USD'] = '$';
    return $currencies;
}
Parameters:
$currencies
Array – Array of currencies
Usage:
add_filter( 'arm_change_email_content_with_user_detail', 'your_function', 10, 2);
function your_function($mailcontent, $user_id) {
    //$mailcontent Email Content.
    //$user_id User ID.
    $mailcontent = $mailcontent." Extra Mail Content.";
    return $mailcontent;
}
Parameters:
$mailcontent
Email Content
$user_id
User ID
Usage:
add_filter( 'arm_restrict_user_before_login', 'your_function');
function your_function($blocked_ips) {
    //$blocked_ips Blocked IP Addresses.
    $blocked_ips[] = '255.255.255.1';
    return $blocked_ips;
}
Parameters:
$blocked_ips
Array – Blocked IP Addresses
Usage:
add_filter( 'arm_change_user_avatar', 'your_function', 10, 5);
function your_function($avatar, $id_or_email, $size, $default, $alt) {
    //Filter user avatar.
    if ($id_or_email == '26') {
        //pass your custom image url in src.
        $avatar = ''.$alt.'';
    }
    return $avatar;
}
Parameters:
$avatar
Whole img tag to be returned
$id_or_email
user id or email address
$size
Image height and width
$default
Default Avtar image tag
$alt
Image alt value
Usage:
add_filter( 'arm_get_all_common_message_settings', 'your_function');
function your_function($common_messages = array()) {
    //$common_messages Array of common messages.
    $common_messages['some_option'] = "Some Message";
    return $common_messages;
}
Parameters:
$common_messages
Array – Array of common messages
Usage:
add_filter( 'arm_get_all_block_settings', 'your_function');
function your_function($all_block_settings = array()) {
    //$all_block_settings All Security Settings.
    $all_block_settings['some_option'] = "Option Value";
    return $all_block_settings;
}
Parameters:
$all_block_settings
Array – All Security Settings