I’m new to magento , I want to integrate magento with quickfile , every time when I get an invoice in magento to be pulled on quickfile !

I tried to do something but I don’t know what client id to put in this code `

<?php $  accountNumber      = '####';       // QuickFile account number $  applicationID      = '####';   // Application ID $  apiKey             = '####';   // Account API Key $  submissionCode     = uniqid();         // Randomly generated submission number, but this can be anything unique  $  endPoint           = 'https://api.quickfile.co.uk/1_2/invoice/create';  $  data   = [     'payload'       => [         'Header'        => [             'MessageType'       => 'Request',             'SubmissionNumber'  => $  submissionCode,             'Authentication'    => [                 'AccNumber'         => $  accountNumber,                 'MD5Value'          => md5($  accountNumber . $  apiKey . $  submissionCode),                 'ApplicationID'     => $  applicationID             ]         ],         'Body'          => [             'InvoiceData'   => [                 'InvoiceType'   => 'INVOICE',                 'ClientID'      => 12345,                 'ClientAddress' => [                     'Address'       => '123 High Street<br>London<br>AA1 1AA<br>United Kingdom',                     'CountryISO'    => 'GB'                 ],                 'Currency'      => 'GBP',                 'TermDays'      => 14,                 'Language'      => 'en',                 'InvoiceLines'  => [                     'ItemLines'     => [                         'ItemLine'      => [                             'ItemID'            => 0,                             'ItemName'          => 'USB Cable',                             'ItemDescription'   => '2.5m USD Cable (Blue)',                             'ItemNominalCode'   =>  4000,                             'Tax1'      => [                                 'TaxName'       => 'VAT',                                 'TaxPercentage' => '20.00',                                 'TaxAmount'     => '2'                             ],                             'UnitCost'  => '10.00',                             'Qty'       => 1                         ]                     ]                 ],                 'Scheduling'    => [                     'SingleInvoiceData' => [                         'IssueDate'         => '2018-01-25'                     ]                 ]             ]         ]            ] ];  $  ch = curl_init($  endPoint);  curl_setopt_array($  ch, array(     CURLOPT_POST                => TRUE,     CURLOPT_RETURNTRANSFER      => TRUE,     CURLOPT_HTTPHEADER          => array('Content-Type: text/json'),     CURLINFO_HEADER_OUT         => TRUE,                 CURLOPT_POSTFIELDS          => json_encode($  data),     CURLOPT_SSL_VERIFYPEER      => TRUE // This may need to be false if testing from localhost ));  $  response               = curl_exec($  ch);  $  httpCode               = curl_getinfo($  ch, CURLINFO_HTTP_CODE);  $  return                 = json_decode($  response);  if($  httpCode != 200) {         echo 'Curl bad!'; } else {          echo 'Curl successful!'; }` 

Can somebody help me with this ! Thank you