Mohamed - We have thoroughly tested this version and we are receiving the following error instead of a credit card form:
The following errors have occurred.
(13) The merchant login ID or password is invalid or the account is inactive.
We have contacted Authorize.net and they have verified that all credentials being used are valid and the account is active. We have also verified this by testing the AIM method. The plugin's AIM method works as expected with the exact same credential configuration.
Authorize.net says this error is a result of the form being posted to the wrong URL. The URL should be
secure.authorize.net/gateway/transact.dll
and this is the URL we have in the plugin's URL field. It seems the DPM version is not posting to this URL, however.