Debit cards are not currently supported with Square Register payments. Visa Interac co-branded debit cards can be used to pay Square Invoices or for Online Store purchases.
Square works with Canadian-issued and most non-Canadian issued credit cards with a Visa, MasterCard, American Express, Discover or JCB logo only. If you use another payment processor to accept debit card payments, you are able to track your debit payments by selecting “Other” and then “Debit/Credit” as your payment type. Keep in mind that this feature is for tracking purposes only.
Square processes all accepted credit cards with the same simple rates.
If you have any further questions, feel free to write in here.