This is nice.
https://www.totalassignmenthelp.com/blog/narrative-conventions/

Which is the previous version?

Has anyone been able to get this plugin to work on Moodle 3.9? I tried for weeks (if not months) to get this plugin to work for our Moodle-site Moodle 3.8.3+ (Build: 20200605) but the Developers of this plugin were never able to get it to work or be supported for our Moodle-site (kinda blows my mind)... we're updating to 3.9 in the coming weeks and hopefully this is working now? Thanks!

This is causing us problems on moodle versions 3.8, 3.9, and 3.10. We have it working in moodle 3.7. It looks like changes were made after this version, it no longer asks for the name or address of the purchaser.

We've captured some logs from two different versions of the plugin, I hope it helps.
#####################
moodle version 3.10 -
authorize.net plugin
2.5 (Build: 20150610)
2019020401

results: after copying missing files lib/eventslib.php - PHP Fatal error: Cannot redeclare events_get_cached() (previously declared in /var/www/moodle/lib/deprecatedlib.php:2648) in /var/www/moodle/lib/eventslib.php on line 38

#####################
moodle version 3.10 –
authorize.net plugin
2.5 (Build: 20150610)
2020072400

results (plain setup nothing special):

BROWSER DEBUG STACK:
Exception - Call to a member function enrol_user() on null
Debug info:
Error code: generalexceptionmessage
Stack trace:
• line 237 of /enrol/authorizedotnet/update.php: Error thrown
Output buffer:
Notice: Undefined variable: plugin in /var/www/moodle/enrol/authorizedotnet/update.php on line 237

From Apache2 error_log:
[Wed Feb 03 13:31:23.252419 2021] [php7:notice] [pid 310329] [client 10.155.250.143:6979] Debugging: Coding problem: $PAGE->context was not set. You may have forgotten to call require_login() or $PAGE->set_context(). The page may not display correctly as a result in \n* line 503 of /lib/pagelib.php: call to debugging()\n* line 1543 of /lib/pagelib.php: call to moodle_page->magic_get_context()\n* line 1949 of /lib/setuplib.php: call to moodle_page->initialise_theme_and_output()\n* line 49 of /enrol/authorizedotnet/pay_process.php: call to bootstrap_renderer->__call()\n, referer:
[Wed Feb 03 13:31:23.395083 2021] [php7:warn] [pid 310329] [client 10.155.250.143:6979] PHP Warning: SimpleXMLElement::__construct(): namespace warning : xmlns: URI AnetApi/xml/v1/schema/AnetApiSchema.xsd is not absolute in /var/www/moodle/enrol/authorizedotnet/pay_process.php on line 72, referer:
[Wed Feb 03 13:31:23.395166 2021] [php7:warn] [pid 310329] [client 10.155.250.143:6979] PHP Warning: SimpleXMLElement::__construct(): <createTransactionRequest xmlns="AnetApi/xml/v1/schema/AnetApiSchema.xsd"> in /var/www/moodle/enrol/authorizedotnet/pay_process.php on line 72, referer:
[Wed Feb 03 13:31:23.395208 2021] [php7:warn] [pid 310329] [client 10.155.250.143:6979] PHP Warning: SimpleXMLElement::__construct(): ^ in /var/www/moodle/enrol/authorizedotnet/pay_process.php on line 72, referer:
[Wed Feb 03 13:31:23.595718 2021] [php7:notice] [pid 310329] [client 10.155.250.143:6979] PHP Notice: Undefined property: stdClass::$authCode in /var/www/moodle/enrol/authorizedotnet/pay_process.php on line 128, referer:
[Wed Feb 03 13:31:23.595807 2021] [php7:notice] [pid 310329] [client 10.155.250.143:6979] PHP Notice: Undefined property: stdClass::$responseCode in /var/www/moodle/enrol/authorizedotnet/pay_process.php on line 129, referer:
[Wed Feb 03 13:31:23.595854 2021] [php7:notice] [pid 310329] [client 10.155.250.143:6979] PHP Notice: Undefined property: stdClass::$transId in /var/www/moodle/enrol/authorizedotnet/pay_process.php on line 130, referer:
[Wed Feb 03 13:31:24.169886 2021] [php7:notice] [pid 310329] [client 10.155.250.143:6979] PHP Notice: Undefined variable: plugin in /var/www/moodle/enrol/authorizedotnet/update.php on line 237, referer:
[Wed Feb 03 13:31:24.173920 2021] [php7:notice] [pid 310329] [client 10.155.250.143:6979] Default exception handler: Exception - Call to a member function enrol_user() on null Debug: \nError code: generalexceptionmessage\n* line 237 of /enrol/authorizedotnet/update.php: Error thrown\n, referer:

Anyone having luck with this plugin, seems like the Developers no longer maintain this???

User authentication failed due to invalid authentication values.
I replaced in pay_process.php to production link which is api.authorize.net/xml/v1/request.api
and i have new transaction key and API login ID and public key and i reset these 2 times till now, and i still getting this error User authentication failed due to invalid authentication values. is there any solution please.

Hello, The newest version of the plugin, which I downloaded for Moodle 3.11 doesn't take us to the secure Authorize.net page (the one shown on picture 4 above)! Instead, it displays a popup, which asks for a payment information on the school page.

It shouldn't be like that! In regards of the Data security, students should be take to a secure Authorize.net page. Furthermore, the pop up looks very unprofessional, like a quick temporary solution.

PLEASE CLARIFY WHAT IS GOING ON AND IF THE SECURE AUTHORIZE.NET PAGE WILL BE BROUGHT BACK!

Hi all, thanks for your patience.

We have been working on the fixed and we are yet to share the update.
Here is the fixed plugin file: https://drive.google.com/file/d/14OUbJAgNBGOF-O-ptZl5HfODeTx7Sibw/view?usp=sharing

Can you please test and confirm whether the issues are resolved?

Hi DualCube Team, is there any chance that you will develop a plugin which uses Authorize.net as an access restriction of course activities or sections? Thank you.

Has anyone successfully gotten this to work in Moodle 4.0?

STH, we will look into your suggestion. Our dev team will take further decision on this.

Hi DualCube team, could you let me know if the latest plugin support echeck? Our school is considering using echeck options. Thanks!

Hi ag, currently we don't have support for checks. However, we do have plans to add this in our future update.

Thank you for your reply DualCube Team! I just want to make sure that when you say don't have support for "checks", do you mean e-Checks?

ag, by check, we are referring to "e-check".