@property<EOL><INDENT>def refund_id(self):<DEDENT>
return self._refund_id<EOL>
Gets the refund_id of this InventoryAdjustment.
The read-only Square ID of the [Refund][#type-refund] that caused the adjustment. Only relevant for refund-related state transitions.

:return: The refund_id of this InventoryAdjustment.
:rtype: str