When you say send 1-way payments only, do you mean 1. NOT to send payments back and forth between two accounts, or 2. never receive money?
For example, do you consider the following as an one-way payment:
Account 1 sends $1000 to Account 2
Account 2 sends $1000 to Account 3
Account 3 sends $1000 to Account 1
Here, each account is sending and receiving $1000, but none are sending and receiving to/from the same account.