[amp story shopping] Price discount / badge

[processprocess]

Description

Enable a slashed out price.

An originalPrice field could be added to the config. "price" seems like it should always be the active price.

Badge UX will need to be finalized. This could be a set list of strings like "discounted" or "two days only".

Look into possibility of updating this like amp-list, where it only updates a section of the data so it's always up-to-date.
This can be accomplished by using a src attribute and updating the data but there is interest in understanding if just a piece of the template can be updated.
The recommended approach for this is to use the src attribute instead of updating the inline JSON.

[cpauwels]

@processprocess IMO if the customer wants the up to date price, they can set a src on the <amp-story-shopping-attachment> and leave the inline JSON as a fallback. Also easier to maintain since it's only one endpoint instead of two (one for the product, the other one for the price)

[stale]

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