identity authentication

qs meng <qsmeng@...>

Hi experts, 
      In the current fabric design, the client app is the use of Fabric. Running a client app is a heavy cost  for a mobilephone user. We design a payment system, where a user can sign a payment request with his/her private key, submit it to a client app and then to Fabric.  
A problem exists that how the identity of the user or requestor can be authenticated?  Can anyone give me some suggestions?
 Thank you.
 Best regards,


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