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Mainstream
Mainstream (MMS) Resources
Important notices, forms, and contacts for MMS-related equipment and services
🚫 We DO NOT board on Mainstream anymore.
Please follow the guidance below for equipment, services, and support/cancellation requests.
MMS Additional Equipment
Click the button below to view the MMS Additional Equipment form.
MMS Additional Services
Click the button below to view the MMS Additional Services form.
Account Changes & Cancellations
Merchant action required: If a merchant needs to cancel their account or perform a bank change, they must call Mainstream directly.
Mainstream (MMS) Contacts
Customer Service
Email: csresponseteam@mainstreamms.com
Phone: 866-674-1020 (opt 2)
Hours: 9:00am–6:00pm, Mon–Fri
Representative
Name: Glenn Brock
Email: glenn.brock@e-hps.com
Listed as the rep email on the contact sheet.