Hi there!
Thanks for reaching out.
According to the documentation, the currency can be added by editing the spcurrency.php file from the following location:
administrator/components/com_spbooking/models/fields/spcurrency.php
You can add the Nigerian Naira details there (currency name, code, and symbol), then save the file. After that, go to:
Joomla Backend → SP Booking → Global Configuration → Payment Settings
and check the currency dropdown. The newly added currency should appear there.
If you cannot find the file, please make sure you are checking the administrator folder path mentioned above, not the regular components folder.
Please let us know if you still cannot locate it, and share a screenshot of the folder structure you are checking.
Best regards,