PLUGIN STRUCTURE(pages that will be shown on admin side)
-> Invoiced users
-> Send New invoice
-> Rating settings
FLOW OF PLUGIN
-> admin will have a page named send invoice .. admin will fill the details and send the invoice in pdf format attached in mail to user with the link to rate the company
-> user will rate company and according to company settings
-> good review bad review process like flyttebud..
-> user can see the invoices sent in past.