I installed at www.aawisdom.com/store. It didn't work. I got this installed
Consolidated Login with Guest Checkout for 2.3.1 v1.0.
If yours really supposed to work, I can only think of three reasons why it didn't work.
1. Because Guest Checkout required me to erase create_account.php.
2. My facebook App was in "Sand Box" mode."
3. My store has Configuration->Session-> Force Cookie Use to be false.
However, the google login also didn't work.
Now I will test at aawisdom.com/store2 and try again. Guest Checkout isn't installed there.
Lastly, not only it didn't work, it messed up all sign up and caused errors. All new sign up will get this message if I kept it installed:
1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '1,1' at line 1
insert into customers_info (customers_info_id, customers_info_number_of_logons, customers_info_date_account_created, valid_address, personal_details_valid) values ('25', '0', now()),1,1
Any sugesstion or clarification?