Update an earmark balance.

This endpoint generates the following events:

• Platform authorization created
• Account balance changed
• Account balance changed (Availables)
• Transaction created
• Earmark created, updated, or canceled with UPDATED action.

NOTES:

• This endpoint requires an account token - an access token encoded with an external account ID. Tokens can expire quickly, which can result in a 401 Unauthorized message.
• To find the correct reason IDs, refer to the List account status reasons endpoint.
• The maximum number of internal operation inputs (updates that change the earmark amount) allowed is 2,000. Update requests that exceed this limit return bad request errors.
• An earmark balance cannot be reduced to zero as a result of this operation. If successfully executing the request would result in a zero balance, the request fails and a bad request error is returned. If you want to reduce the balance to zero, you must use Cancel earmark, instead.