Redmine Invoices plugin multi-site
Simple invoices management
Invoices statuses basic workflow
Redmine CRM integration (required CRM Pro or CRM Light 3.1+ http://redminecrm.com/projects/crm)
Multi currency support
Multi language support
Discounts (percentage and flat)
Assignable to Redmine users
Custom lines units
Per line tax value
Ajax line editing
Expenses module
REST API for invoices
Redmine Invoices plugin multi-site
Contentwise responsible person: Micro Shop Helper