Examples (Incoming SMS)

Php

    // STEP 1
    // incoming request parameters

    $from = $_GET["from"]; // sms sender
    $to = $_GET["to"]; // shortcode
    $keyword = $_GET["keyword"]; // first word
    $text = $_GET["text"]; // the complete text
    $timestamp = time();

    // STEP 2
    // build your logic on how to respond the incoming request

    switch($keyword){
        case "one":
            $reply = "You (". $from .") have been subscribed to campaign one";
            break;
        case "two":
            $reply = "You (". $from .") have been subscribed to campaign two";
            break;
        default:
            $reply = "Invalid campaign name";
            break;
    }

    // STEP 3
    // may be you need to save the request to your own database
    // @optional

    mysql_connect("localhost", "username", "password");
    mysql_select_db("sparrow_sms");

    mysql_query("insert into logs_incoming
    (`from`, `to`, `keyword`, `text`, `timestamp`)
    values ('".mysql_real_escape_string($from)."',
    '".mysql_real_escape_string($to)."',
    '".mysql_real_escape_string($keyword)."',
    '".mysql_real_escape_string($text)."',
    '".$timestamp."'
    )");

    // STEP 4
    // send reply back to Sparrow SMS
    // This has to be STRICTLY 160 chars (max)

    die($reply);