Hello Sandra,
Using TelPay, there is virtually no change to the process of doing system cheque runs. TelPay sends the necessary advices to your clients and will get their banking information if necessary (they already know most business bank accounts in Canada). There is some setup paperwork with them.
We like their service a lot and believe it is much nicer (and more secure) than any EFT service currently offered by the banks.
As Ralph mentioned, we will provide EFT through other providers for a fee if necessary.
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Andrew Bates