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The v3 Returns API supports multicollo returns. This allows you to create a return shipment which consists of multiple parcels. One thing to keep in mind is that the way this endpoint supports multicollo is through replicating the same parcel details to create multiple parcels. This means that for shipments where customs documentation is involved the return should be consolidated to a single packaging unit to avoid unnecessary customs delays/issues. The parameter collo_count will be used to set the amount of parcels that the incoming shipment will contain. Within the response we will return the parcel ID for each individual parcel created through this endpoint.
For shipments requiring customs documentation, consolidate the return to a single packaging unit. The multicollo endpoint replicates parcel details, which can cause customs delays when documentation is split across multiple parcels.