Provide a step-by-step mechanism for the reaction below. Include all intermediates, formal charges and correct arrow pushing of electrons. 
Definitions:
Financial Reserve
A portion of funds set aside by a business or organization to cover future obligations or unexpected expenses.
Zero-balance Accounts
Bank accounts that are maintained at a zero balance by automatically transferring funds from a master account in amounts only large enough to cover presented checks or debits.
Master Account
A central account that can control or aggregate several sub-accounts, often used in finance for managing investments or in banking.
Lockbox System
A service offered by banks to companies for the rapid collection of customer payments, by providing a special address to which payments are sent directly.
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