In order to streamline our documentation and clear up some confusion that developers have had, we have decided to move the relevant information in the DPM guide into an appendix in the SIM guide.
When you use SIM, you connect to Authorize.Net’s hosted payment form. When you use
DPM, you host your own payment form, giving you more control over its appearance. The
payment information is then directly posted to the payment gateway so that it is never
stored on the merchant’s server.
There are a few differences in the API fields that you submit, depending on whether you
use SIM or DPM:
- With SIM, you use x_show_form. With DPM, you do not.
- With DPM, you also use x_card_num and x_exp_date.
- With DPM, x_relay_always should be set to true. As a result, an error never displays on the payment form; instead, the relay response is triggered.
