Déclaration REST :

$app->post('/res', \Core\Controllers\ResController::class . ':create');

Fonction qui récupère les arguments via $request

public function create(RequestInterface $request, ResponseInterface $response, $aArgs)
    {
        if (!empty($aArgs)) {
            $aArgs = $aArgs;
        } else {
            $aArgs = $request->getQueryParams();
            $aArgs['data'] = json_decode($aArgs['data']);
            $aArgs['data'] = $this->object2array($aArgs['data']);
        }

        $return = $this->storeResource($aArgs);

        if ($return['errors']) {
            return $response
                ->withStatus(500)
                ->withJson(
                    ['errors' => _NOT_CREATE . ' ' . $return['errors']]
                );
        }

        return $response->withJson($return);
    }

Script PHP pour reach le web service

<?php

/**
 * This PestXML usage example pulls data from the OpenStreetMap API.
 * (see http://wiki.openstreetmap.org/wiki/API_v0.6)
 **/

require_once '../Pest.php';

$pest = new Pest('http://192.168.10.114/cs_maarch/');

$login = 'superadmin';
$pass = 'superadmin';
$pest->setupAuth($login,$pass);

$params = array(
                        'encodedFile' => 'VEVTVA==',
                        'data' => array(
                                        array('column' => 'destination', 'value' => 'DGS', 'type' => 'string'),
                                        array('column' => 'doc_date', 'value' => '2017-11-20 00:00:00', 'type' => 'string'),
                                        array('column' => 'type_id', 'value' => '114', 'type' => 'string'),
                                        array('column' => 'subject', 'value' => 'Sujet', 'type' => 'string'),
                                        array('column' => 'custom_t14', 'value' => 'SVE', 'type' => 'string'),
                                        array('column' => 'custom_t15', 'value' => 'nathan.cheval@outlook.fr', 'type' => 'string'),
                                        array('column' => 'priority', 'value' => 3, 'type' => 'string'),
                                  ),
                        'collId' => 'letterbox_coll',
                        'table' => 'res_letterbox',
                        'fileFormat' => 'txt',
                        'status' => 'ATTSVE'
                );

$test = $pest->post('/rest/res',$params);
var_dump($test);

?>