# Variables
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# Structs
The request proto for AckServerImpressions call.
The product that was altered.
The response message for AckServerImpressions.
The request proto for `Predict` call.
The context of this request.
The response proto the predict call.
A single predict call result.
The response of a product.
The product proto.
The brand proto.
The category proto.
The single node of the category.
The product display information.
The price proto.
The detailed product specs.
Seller info.
The product error.
The user proto.
Optional.
The error proto for a single user.
The proto that represents an user event.
The context for this event.
The device proto.
The scene where the event happened.
The error detail for a single user event.
Request proto for WriteProduct method.
The response for the WriteProduct call.
Request proto for WriteUserEvent method.
The response proto for WriteUserEvents.
Request proto for WriteUsers method.
The response proto for WriteUsers call.