Subdirectory intergration with Wordpress

I already have the following in my .htaccess for Wordpress:

 BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
# END WordPress

What’s the best way to add /subdirectory when it’s using almost the same .htaccess rules?

If you installed InvoicePlane in a subdirectory of Wordpress just leave the Wordpress .htaccess unchanged and replace RewriteBase / with RewriteBase /invoiceplane-directory in the .htaccess file in the InvoicePlane folder.

Thanks Kovah. Where does one enter their database login information (I put it in invoiceplane/application/config/database.php), and do the initial table creation? I’m getting this:

A Database Error Occurred
		Error Number: 1146Table 'iplane.ip_settings' doesn't existSELECT *
FROM (`ip_settings`)Filename: $PATH/invoiceplane/modules/settings/models/mdl_settings.phpLine Number: 59	

Perhaps also worth noting, from the local file system, there is no /modules/ in invoiceplane/

Sorry for the harsh question but why don’t you follow the installation guide? Because you should not put any credentials into the database.php file…