Basic requirements for the Google placeholder parameter

[samiaseo75]

ID – This is the ID attribute associated with the offer. This attribute is replaced with the [id] attribute specified in the offer source.
Optional placeholder requirements
Color - This is the color attribute associated with the offer. This attribute is replaced by the [color] attribute specified in the offer source.
Size - This is the size attribute associated with the ig data offer. This attribute will be replaced by the [size] attribute specified in the offer source.
How did Google respond to this?
The search engine encourages advertisers to provide their customers with the best possible user experience. Although it is not required, Google recommends that you consider:

Support a fast checkout experience with shopping experiences designed for customers coming directly from Google.
Clear communication so customers can easily verify who they are buying from, what they are buying and how much the purchase will cost.
Why do we care?
This feature can offer customers a more convenient shopping experience and potentially increase traffic to a brand's website.