There is not functionality specifically built into MemberMouse to allow for accepting offline payments. But there are clients who have had the need for this, so it can be accomplished
Clients who have wanted to accept online payments usually follow these steps:
Set up a specific product and bundle for Offline payments. This product will no cost associated with it, and when the member 'purchases' this bundle, the member is added to a free membership level.
Having a solution for payment by check which is included in financial reports is critical for membership site owners dealing with institutions. Furthermore, an automated solution (or at least an option) which allows immediate access to protected content for check payers would also be ideal. Please consider adding this valuable feature.