MatchKey- Only used if the product is tracking inventory by size and color. This tells it which of the fields to use as an ID to locate the desired product.
On the <Inv> node, you only need the VariantID and Quantity fields if no MatchKey is specified (simply inventory update).
Warnings:
None
Example(s):
Set the regular inventory for variantID 47 to 376.
<AspDotNetStorefrontImport Version="7.1">
<InventoryUpdate>
<Inv Quantity="376" VariantID="47" />
</InventoryUpdate>
</AspDotNetStorefrontImport>