First of all, 'Mailing of Documents' would be cumbersome for people who are not familiar doing it. It will begin with googling by the words of "cover sheet sample template". What a waste of your time! Using this 'Backend', even employees who are not familiar to mailing affairs could send them without mistakes and rudeness.
Quotations and Bill are sent in Trifold and by Standard post.
Catalogs and Brochures are sent in paperboard envelope.
Contract agreements are sent in paperboard envelope and by first-class mail with Signature confirmation.
All the postal matter will be recorded.
The progression of the work will be visualized.
In addition, to add APIs to this 'Backend system', simply arrange an 'Auto-Start Event' as follows. This will allow to call from other Workflows, or from self-developed smartphone application.
Furthermore, by adding APIs for Email-Start, you can let the draft of Postal request stand-by. This might expand the utilization, like directly flow a scanned image files that are sent as email attachments from the MFP, into the Postal Requesting system.
By the way, there are also the terms of 'Front-Office / Back-Office' that are alike 'Frontend / Backend'. They refer to the sections of sales front line such as Sales personnel or Store, and the sections that support Sales, such as Accounting and G.A.. It will bring confusion if you mixed up 'IT system structure' and 'Organizational structure'.