Update transfer metadata by id

Update the metadata on a transfer.

This endpoint can be used to update the metadata on the transfer. No other aspects of a transfer can be updated.

Updating metadata

• To update an existing metadata key’s value, pass the existing key with the new value along with any existing key-value pair(s)
• To remove metadata, pass any key-values pair you want to maintain, and omit the ones you want to delete. To remove all metadata, pass the metadata key with an empty object
• To add new key-value pair(s), pass any existing metadata key-value pair(s) with the new key(s) and new value(s)