Returns are not managed in our connectors. The reason is simple. Every return is exceptional case:
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some customers get money back
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some get credits of store
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some should send product back (and return label should be sent)
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some should throw away product
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some just keep product as gift
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for some replacement should be sent
All is unique so handling of returns is kept as a manual process. And customer support defines what to do on case-by-case basis (manually doing needed changes both on e-Commerce and Odoo side)