<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def payment_init(self, wallet):
 """ Marks all accounts in wallet as available for being used as a payment session. :param wallet: Wallet to init payment in :type wallet: str :raises: :py:exc:`nano.rpc.RPCException` True """


        wallet = self._process_value(wallet, 'wallet')

        payload = {"wallet": wallet}

        resp = self.call('payment_init', payload)

        return resp['status'] == 'Ready'