Generate HMAC signature for GRAB Integration

 Just check your code in any programming language to have following result

(Output: base64 encoded)

plain text = input
secret key = secret
output must be: jYmF0Et6vTLLqjd5o9qgGeDSaaIq7BWvjnKW9wLMaMY=

I use PHP, and here is my code =))

base64_encode(hash_hmac('SHA256', 'input', 'secret', true));