Square Payments API with PHP & CURL - Get Customer List

This example demonstrates getting a customer list from Square, using only PHP & Curl.

* You need an acess token from Square. This example assumes you already have it.

Create new file, for example get-square-customers.php, paste the following and view the list browse to it on your web server.

//set endpoint & access token.
//$endpoint_host = 'connect.squareup.com/v2/';          //production
$endpoint_host = 'connect.squareupsandbox.com/v2/';     //sandbox

$access_token = 'YOUR_APP_ACCESS_TOKEN'; //from Square App Dashboard

$idempotency_key = uniqid();

//Set verify_ssl to false for localhost/unsigned SSLs, and true for production
$verify_ssl = false;  
  
$curl = curl_init();
curl_setopt_array($curl, array(
  CURLOPT_URL => $endpoint_host.'customers?cursor=',
  CURLOPT_SSL_VERIFYHOST => $verify_ssl,
  CURLOPT_SSL_VERIFYPEER => $verify_ssl,
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 60,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => 'GET',
  CURLOPT_HTTPHEADER => array(
    'Authorization: Bearer '.$access_token
  ),
));

$response = curl_exec($curl);
  $err = curl_error($curl);
  $response = json_decode($response);
  curl_close($curl);
  if ($err) {
    echo "cURL Error #:" . $err;
  } else {
    var_dump($response);
  }

Square API Docs: https://developer.squareup.com/reference/square/customers-api/list-customers