Add application id to transaction destinations

_transactions.md

@@ -80,15 +80,15 @@ In step one, one prepares the transaction by specifying:
 - The _currency_ to denominate the transaction by.
 - The _amount_ of value to send in the denominated currency.
 - The _origin_ of the transaction can be an account id in the case of a _deposit_.
-- The _destination_ of the transaction, which can be in the form of a bitcoin address, an email address, an account id, or a Uphold username.
+- The _destination_ of the transaction, which can be in the form of a bitcoin address, an email address, an account id, an application id or an Uphold username.
 
 The following table describes the types of transactions currently supported:
 
 Type       | Origin                     | Destination
 ---------- | -------------------------- | -------------------------------------------------------
 deposit    | _ACH_ or _SEPA_ account id | Uphold card id
 withdrawal | Uphold card id             | _ACH_, _SEPA_ or _Bitcoin_ address
-transfer   | Uphold card id             | An email address, an Uphold username, an Uphold card id
+transfer   | Uphold card id             | An email address, an application id, an Uphold username or an Uphold card id
 
 Upon preparing a transaction, a [Transaction Object](#transaction-object) will be returned with a newly-generated `id`.
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