Monthly income & fee allocation

We receive deposits that appear in the bank feed that correspond with an open sales invoice that relate to monthly membership payments.

The payment statement has the following

• amount requested from client $55
• - business fee $1
• amount settled $54
• - miscellaneous fees $4
• amount deposited $50

How do these 3 items get processed?

The member payment needs to be allocated against the open invoice, the business fee needs to be attributed as does the misc fee all while staying balanced to the deposit of $50.

I'm stumped.

Thanks in advance.