The kiosks can let donors identify their gift as a regular tithe or offering, or direct it to building or missionary funds. The machines send information about the donation to a central church computer system, which shoots the donors an e-mail confirmation.
The Bakers charge between $2,000 and $5,000 for the kiosks, which come in a variety of configurations. They also collect a monthly subscription fee of up to $49.95 for licensing and support. And a card-processing company gets 1.9% of each transaction; a small cut of that fee goes to SecureGive.
So far, seven other congregations have installed or ordered the machines. All of them are Protestant, and most are in the South. If the idea takes off and makes the Bakers rich, Patty says they will thank the Lord -- and give a significant sum to their church.
The concept is in its infancy, but it is part of a broader attempt among houses of worship to boost donations using modern technology. Among the most popular are "e-tithing" systems, which allow churchgoers to set up automatic contributions from their bank accounts -- much as they would their Netflix dues.
But Baker -- a 45-year-old preacher who grew up in the Pentecostal churches of South Carolina -- sees a more dramatic change afoot in the culture of church giving, as Americans increasingly turn to plastic for their everyday expenditures. That has certainly been true outside of church: Six years ago, debit cards were used in 21% of in-store transactions; today they account for a third of them, according to the American Bankers Assn.
At church services, Baker said, the next few years could be comparable to another upheaval centuries ago, when offerings of grain and animals were replaced with what was then the newfangled medium of money.
"I'll bet that caused a stir, too," he said, chuckling.
Baker assumes many churches are not yet ready to change. The need to generate earthly revenue can be a sensitive topic for the clergy; lampooning their less subtle solicitations has been a sport for generations of critics, from Chaucer to heavy-metal bands.
The Bakers have heard naysayers at trade shows mutter disapproval of the kiosks: Some church leaders apparently fear that a technology so closely associated with commerce might come across as crass.
"Not in our church," Baker recalls one group saying as they passed a SecureGive display.