Invoices are created at the end of each week for services rendered. (These invoices are not mailed out). At the end of the month, a statement showing all invoices for the month is mailed out. The statement includes a payment stub. How do you post a payment from a statement? The payment screen only appears to allow you to apply the payment to one invoice (not multiple invoices).
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You can only apply a payment to one specific invoice (Gopher will automatically apply the remainder, if one exists, to other invoices) or you can let Gopher automatically apply the payment without specifying an invoice. You cannot specify multiple invoices to apply a payment to.