title: Signature mismatch in Payfort payment integration
body: <p>I am integrating Payfort payment gateway in my android application. I am using FORT SDKv1.2.
  In the post url for creating token, I am getting error "signature mismatch" always.</p>
  
  <p>Can anybody tell me which signature is to be used?</p>
  
  <p>url - <a href="https://sbpaymentservices.payfort.com/FortAPI/paymentApi" rel="noreferrer">https://sbpaymentservices.payfort.com/FortAPI/paymentApi</a></p>