Following this post: https://www.odoo.com/forum/help-1/payment-acquirer-addon-upgrade-from-ce-version-14-to-ce-version-15-195258
I was able to make changes to accommodate ver 15 compatibility by going through other payment acquirer ver 15 add-ons.
The add-on is getting loaded but I cannot view the add-on in the "Payment Acquirer" Section.
Sharing the download link below for the customised add-on;
https://drive.google.com/drive/folders/1DEIzKLpMtg1_CDLZfbDeAw0B1nDg-60N?usp=sharing
Any help, guidance in that regard will be highly appreciated.