API signature generation

Learn how to generate a signature for further work with the PassMe service.

1. Prepare Parameters: For each request, prepare the parameters that will be transmitted. Include all necessary parameters in the request.

2. Create a Query String: Create a query string by arranging all the parameters in the format key=value, separated by the & symbol.

3. Sign the Query String: Use your private API key to sign the query string. Depending on the programming language used, you can use the following functions:

   • In PHP:

     $queryString = urldecode(http_build_query($params));
     $signature = hash_hmac('sha256', $queryString, $secretKey);

   • In JavaScript (using the CryptoJS library):

     let queryString = Object.keys(paramsObject).map((key) => {
             return `${key}=${paramsObject[key]}`;
         }).join('&');
     let signature = CryptoJS.HmacSHA256(queryString, secretKey).toString();