Our customers pay money in advance for us to hold and later use to pay for different services.
Their reason is they have a budget allocation at the beginning of every month which they later use for a varied services with us.
We can only keep the money as Overpayments as this has no tax impact.
Customers need however a receipt in advance, to use before their finance department to actually make the payment.
We need this functionality in the API to avoid messy manual work in parallel to Xero.