This Custom API script was written to process incoming API calls from Slack (a team chat program we use internally at PCR).
<?php
/**
 * Type: Custom Logic
 * Identifier: helpdesk
 */

// The incoming payload from Slack is JSON encoded
// so we need to decode it...
$payload = json_decode($request["payload"], true);

$user = $payload["user"]["name"];
$callbackId = explode("-",$payload["callback_id"]);
$iconUrl = "https://www.iconexperience.com/_img/v_collection_png/24x24/plain/";
$icon = "error.png";

// find the Contact for this User - using the query function is best with
// bound parameters instead of placing them directly into the query string.
// This protects the database against injection threats
$contacts = $this->query(
    "SELECT RECID FROM CONTACTS C
    LEFT JOIN V_UDF UDF ON UDF.VALUE_TABLE_NAME = 'CONTACTS' AND C.RECID = VALUE_TABLE_RECID
    WHERE UDF.VALUE = :slack_user",
    [":slack_user" => "@".$user]
);

if(!empty($contacts)){
    // the query function always returns an array
    // of rows so we need to look at the first index
    $contact = $contacts[0];

$incidents = $this->query(
        "SELECT SD.*, D.CODE, L.VALUE AS STATUS
        FROM SERVICE_DESK SD
        LEFT JOIN DEPT_HIERARCHY D ON SD.D_OWNER_DEPT_HIERARCHY_RECID = D.RECID
        LEFT JOIN LISTS L ON SD.SD_STATUS_LISTS_RECID = L.RECID
        WHERE SD_NUMBER = :incident",
        [":incident" => $callbackId[0]]
    );

if(!empty($incidents)){
        $incident = $incidents[0];

$workflow = $this->query(
            "SELECT SDWF.*, CONCAT(C.LAST_NAME,', ',C.FIRST_NAME) AS WORKER, L.CODE AS STATUS
            FROM SERVICE_DESK_WORKFLOW SDWF
            LEFT JOIN CONTACTS C ON C.RECID = SDWF.WORKER_CONTACTS_RECID
            LEFT JOIN LISTS L ON SDWF.SD_WF_STATUS_LISTS_RECID = L.RECID
            WHERE SERVICE_DESK_RECID = :sd_recid AND SDWF.RECID = :recid",
            [
                ":sd_recid" => $incident["RECID"],
                ":recid" => $callbackId[2]
            ]
        );

if(!empty($workflow)){
            $wf = $workflow[0];
            if(empty($wf["WORKER"])){
                if($wf["STATUS"] == "PENDING"){
                    if(Core_Model_Api_Servicedesk::assignWorkflow(
                        $wf["RECID"], $contact["RECID"]
                    )){
                        $assigned = "Assigned to @{$user}";
                        $icon = "checkbox.png";
                    } else {
                        $assigned = "Error: Failed to Assign Workflow...";
                    }
                } else {
                    $assigned = "Error: WF is not Pending...";
                }
            } else {
                $assigned = "WF Already Assigned to {$wf["WORKER"]}";
                $icon = "information.png";
            }
        } else {
            $assigned = "Error: Cannot find Workflow {$callbackId[1]} on {$callbackId[0]}...";
        }
    } else {
        $assigned = "Error: Cannot find Incident [{$callbackId[0]}]...";
    }
} else {
    $assigned = "Error: Cannot find User [{$payload["user"]["name"]}]...";
}

$orig = $payload["original_message"];
// the response array is the data that is returned to the original API request
$response = [
    "text" => $orig["text"],
    "attachments" => [[
        "title" => $orig["attachments"][0]["title"],
        "title_link" => $orig["attachments"][0]["title_link"],
        "text" => $orig["attachments"][0]["text"],
        "footer" => $assigned,
        "footer_icon" => $iconUrl.$icon,
        "ts" => time(),
    ]]
];
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