InstallPaymentInstruction
        instruction: The PaymentInstruction to send, for example: 
        
            MyRole=='Caller' orSay 'Roles do not match';
        
        token_type: Defaults to "Unrestricted"
        transaction_id: Defaults to a new ID

def install_payment_instruction(self, instruction,
                                    token_type="Unrestricted",
                                    transaction_id=None):
        """
        InstallPaymentInstruction
        instruction: The PaymentInstruction to send, for example: 
        
            MyRole=='Caller' orSay 'Roles do not match';
        
        token_type: Defaults to "Unrestricted"
        transaction_id: Defaults to a new ID
        """

        if(transaction_id == None):
            transaction_id = uuid.uuid4()
        params = {}
        params['PaymentInstruction'] = instruction
        params['TokenType'] = token_type
        params['CallerReference'] = transaction_id
        response = self.make_request("InstallPaymentInstruction", params)
        return response