Retrieve Payment Transaction Information for this Credential. Typically this will include
        how much payment is requried by the issuer, which needs to be provided by the prover, before the issuer will
        issue the credential to the prover. Ideally a prover would want to know how much payment is being asked before
        submitting the credential request (which triggers the payment to be made).
        Example:
        info = credential.get_payment_info()
        :return:

async def get_payment_info(self):
        """
        Retrieve Payment Transaction Information for this Credential. Typically this will include
        how much payment is requried by the issuer, which needs to be provided by the prover, before the issuer will
        issue the credential to the prover. Ideally a prover would want to know how much payment is being asked before
        submitting the credential request (which triggers the payment to be made).
        Example:
        info = credential.get_payment_info()
        :return:
        """
        if not hasattr(Credential.get_payment_info, "cb"):
            self.logger.debug("vcx_credential_get_payment_info: Creating callback")
            Credential.get_payment_info.cb = create_cb(CFUNCTYPE(None, c_uint32, c_uint32, c_char_p))

        c_credential_handle = c_uint32(self.handle)
        data = await do_call('vcx_credential_get_payment_info',
                      c_credential_handle,
                      Credential.get_payment_info.cb)
        return json.loads(data.decode())