Hello,
The plugin should be compatible with 5.9.
The issue with the menu not showing is most likely one that I have encountered before, but I’m not sure under what conditions it arises:
If you have installed and activated the plugin, but you still don’t see the Wallets menu (and admin warning messages), then the most likely problem is that your admin user does not have the “manage_wallets” capability.
Normally, this capability is automatically assigned to admin users and to the Administrator role, when the plugin is first activated. So, try to deactivate and re-activate the plugin.
Some times this fails. You can use any plugin that’s suitable for editing capabilities and assign “manage_wallets” to the Administrator user role. This will resolve the issue. A good plugin for this job is https://wordpress.org/plugins/user-role-editor/
Simply navigate to Users -> User Role Editor and select the “Administrator (administrator)” role. Click on “add capability” and type “manage_wallets”.
If you want to achieve the same via the wp-cli, you can issue the following command in the unix shell of your WordPress server:
wp cap add administrator manage_wallets
Hope this helps.
Please let me know if this didn’t help. If you have any other questions about the plugins please open a new thread.
with regards