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returnShippingFeesAmount

A Schema.org Property

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.
Amount of shipping costs for product returns (for any reason). Applicable when property returnFees equals ReturnShippingFees.
Values expected to be one of these types
MonetaryAmount
Used on these types
MerchantReturnPolicy

Source

https://github.com/schemaorg/schemaorg/issues/2880