Add configuration for warranty, payment options, and bookkeeping integration

- Defined constants for warranty months, eligibility window, and service months.
- Enabled automatic invoice forwarding to bookkeeping software with email configuration.
- Integrated payment options for Mollie and PayPal, including API keys and webhook settings.
- Disabled pay on delivery option.

account_manage.php

@@ -272,7 +272,7 @@ $view .= '<div class="tabs">
 //Dropdown
 
 $partner_data = json_decode($_SESSION['authorization']['partnerhierarchy']);
-$soldto_dropdown = listPartner('soldto',$_SESSION['authorization']['permission'],$accounthierarchy->soldto,'');
+$soldto_dropdown = listPartner('soldto',$accounthierarchy->soldto,'',$_SESSION['authorization']['permission']);
 
 $view .= '<div class="tabs">
             <a href="#">'.$tab3.'</a>