Helpdesk Phone Numbers

These are helpdesk numbers for existing merchants of ISD Financial. Please make sure you have your Merchant ID available before calling. 

Main Phone Numbers:

Customer Care:  800.935.5961
Terminal Helpdesk:  800.935.5961
T-Tone Authorization Only:  800.228.1111
Voice Authorization Phone:  800.228.1122  

American Express:

Customer Service:  800.528.5200
Authorization for AVS:  800.528.2121  

Discover Card

Customer Service:  800.347.2000
Authorization for AVS:  800.347.1111  

Merchants on Nashville Platform:

Customer Service:  800.647.3722
Terminal Helpdesk:  800.647.3722  

Merchants on North Platform:

Customer Service:  800.876.0026
Terminal Helpdesk:  800.346.3315  

Merchants on Bypass Platform:

Customer Service:  800.238.7675
Terminal Helpdesk:  800.733.3322
Petroleum Department:  800.726.2629

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