All churches of any size should use Tithe, Offering and Giving Envelopes for the recordings of money received by the church and IRS accounting.
There is many other giving methods but using envelopes for tithes and giving has been a true method for accurate accounting.
Benefits are accurate money recording with documents for the church and IRS accounting.

The envelope gives privacy and confidential information for the giving person.
It can have a place to request a prayer for a friend in need.
Less uncounted money for stewards or monitors to handle.
It serves as a reminder of the financial responsibility the member has to the church.

Designations for money on the envelope can be selected by the giver.
When offering envelopes are incorporated into the giving method of a church community, members are prompted and more likely to give on a consistent basis.