This POST endpoint transfers funds immediately from a source wallet to a destination wallet.
The source_token must refer to a wallet owned by the authenticated client (either a client wallet token or a user wallet token belonging to the client).
The destination_token can refer to any user wallet in the system, or to another client wallet that is linked to this client (e.g. a subclient or sister-client relationship — transfers to unrelated client wallets are not permitted).
Transfers between wallets of different currencies are supported; an FX exchange rate will be applied automatically.
Transfers are executed immediately upon request and are not reversible.