Does anyone know the dollar amount limit for an invoice to be able to click and pay online?

I believe it varies depending on what you were approved for. When signing up you would have to have declared an average number of invoices, an average dollar amount and usually a maximum

@GOEAccounting 

You should aware of your daily limit to accept payment. As additional option, consider having MP as the backup payment service.

https:// melio.grsm.io/quickbooks