Would be great to be able to pay employees and show this on account so not liable for the tax

It would be helpful to be able to generate an invoice which shows the agreed payment plan and due dates of payments.

Be able to see when and why a transaction is declined and be able to re-enable the card if necessary

It would be great to have desktop access to my account rather than just the app.

Add Counting Up to the list of banks that can use Apple Pay

At the moment, all the items in the invoice must have positive or zero value. I would like the ability to include items with negative value (discount, refund, etc.) as long as the total invoice ends up in a positive value.

When using sum up card as a payment method for invoices I am left with the card fee unpaid on the invoice, this means that the invoice stays in the unpaid list and shows the full amount outstanding. I need to be able to allocate the card fee to the invoice somehow

Let a business partner have a card or access to the account

Jake: Invoice number - customisable? It would be useful to be able to customise the invoice number to tie in to my existing system of numbering. (obviously this custom reference would need to be unique - but could add requirement for it to be unique if choosing to customise)