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Unfortunately, MercuryPay Credit Card Payment Services is not currently supported.
I will contact our developer to see if there is possibility to integrate MercuryPay Credit Card with JotForm, but we can not give you any time frame when and if this will be implemented.
However, there is a chance that you can use our Authorize.Net Integration. As far as I understand, Authorize.Net support different merchants, so in theory it should be possible to use MercuryPay merchant account with them. You might consider contacting Authorize.Net and other merchants to see if this is something that might work in your case.
Also, some processing services support Authorize.Net emulation mode, so this might be another option.
Hope this will help.
Thank you. I will try these options.