[DO NOT MERGE] CEXT-5400: Add origData to the event payload

[oshmyheliuk]

Purpose of this pull request

This pull request (PR) adds information about new functionality, such as original data in the event payload and a new onChange operator based on original data.

Affected pages

• https://developer.adobe.com/commerce/extensibility/events/conditional-events/
• https://developer.adobe.com/commerce/extensibility/events/events-original-data/

Links to Magento Open Source code

• ...

[danperezAdobe]

can we also add an example when the events need to be triggered once qty or price is being changed?

[oshmyheliuk]

The problem here is that we don't have OR rules, all rules are processed as AND.
By adding the next rules:

          <rule>
               <field>quantity_and_stock_status.qty</field>
               <operator>onChange</operator>
               <value />
           </rule>
          <rule>
               <field>price</field>
               <operator>onChange</operator>
               <value />
           </rule>

The event will be triggered only if both price and quantity are changed.

Currently, it's possible to resolve by creating a separate subscription with an Alias name, one for price change and one for quantity change.

[keharper]

I think we should we state somewhere that OR rules aren't supported.

[oshmyheliuk]

We have the next definition at the beginning of that page.

If one or more rules evaluate as false, the service sends neither the parent event nor the conditional event, unless the parent has been subscribed separately, without any rules.

Should we mention it one more time?

[keharper]

I think we should we state somewhere that OR rules aren't supported.