From 12 January, customers paying by card in one of Drake & Morgan’s seven bars and restaurants will be able to give 50p to the learning disability charity.
The donation will be collected by Pennies, a ‘virtual’ charity box company, when the donation is made through a chip or pin device.
Mencap works to support people with learning disabilities, as well as their families and carers, by fighting to change laws, improve services and enable greater access to education and employment.
It claimed to help people with everything from household tasks and managing money, to socialising and staying healthy, so they can live their lives as they choose.
Gabi Clipp, head of people at Drake & Morgan, said: “We’re proud and delighted to be given the opportunity to support such a fantastic charity.
“We’re looking forward to raising money to help those with a learning disability as well as their families and carers, so they can lead better lives.”
Drake & Morgan said the latest move was part of its continued support of several charities, with proceeds from Pennies split between Mencap and Kids Company, which supports vulnerable inner-city children.
It claimed to have raised £350,000 for Kids Company between January and November 2014.