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If I use the authorize.net in the form ( I do have account with them) will one be able to be directed to a webpage that I designed after paying ?Asked by aselma10 on October 16, 2013 at 07:00 PM
Actually yes, you can make it to work that way.
Authorize.net doesn't submit the user to their pages. It will process everything. To find out how to redirect to your page upon submission, please check the guides below for further help.
If you have more questions regarding to this, let us know
Is there a way to have a popup box to confirm upon submit? (such as 'are you sure' etc)
I'm afraid that there is no such option available at the moment, however you can combine conditionals logic with a radio button field where the user will be asked if it is sure to buy after filling the authorize.net payment tool, the submit button will be hide until the user choose between YES or NOT from the "Are you sure" question.
Check this basic example:
You can clone this example by following this guide in order to make further investigations about how it works.
Hope it helps
please let us know if you need further assistance