Update a member transaction

PUT https://trac-demo.stage.pebble.cloud/api/v1/orgs/{org_id}/members/{member_id}/purses/{purse_id}/transactions/{transaction_id}

Only transaction metadata can be updated.

Note that these transactions always involve a purse. If the transaction does not involve a purse it is an organization transaction.

You must provide the If-Unmodified-Since header. See Optimistic Concurrency Control