Price: Bulk pricing promotions

[tradmangh]

Problem

Time-limited bulk pricing promotions are not supported

• Buy x get x for free (BOGO)
• Discount above x quantity

Proposed solution

The mentioned scenarios could be handled through additional fields.

Multiple discount (BOGO):
price_multi_quantity
(i)price_fixed_units is the total quantity (e.g. 2+1=3, 3+3=6)

Quantity discount:
price_min_quantity

Time limitation:
optional:(price_date_start), price_date_end
(i) price_date_end could be calculated by requesting the duration_days as a user input

Additional context

To be able to enter promotions upfront it will be necessary to make future dates selectable in UI (e.g. 14 days ahead to limit chance of wrong inputs)

[raphodn]

Thanks @tradmangh !

I created a dedicated discussion here to try to list all the known promotions, and see if we can find a pattern for a simple implementation (that would cover "80%" of the cases)

[raphodn]

fyi thanks to #76, in the web UI you can now specify which kind a discount from a short list