Registration not required:

Contacts you are transacting with have the option to create an account, but it is not mandatory.

Your clients can securely pay requests from their bank account or credit card without creating a Truss account.

Your vendors can deposit the funds you send them into their bank account. However, vendors who have Truss accounts will be able to access the funds you send them instantly. For example, when sending funds to a contact with a Truss account, they can use those funds immediately on their card.