It looks like you are trying to read some property inside an “items” object. This could fail because maybe you are trying to read that before getting the items, or maybe there are no items there at all for some reason.
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Hi @Matias.Monday , Actually the variable type was Int for $itemId variable, but it should be ID!. I made this change in the Quickstart - Integrations code and it worked. Maybe the Quickstart code needs to be changed?