QuickBooks needs to offer the ability for QuickBooks users to send and customers to receive a SINGLE email with all outstanding invoices and the ability to pay some or all of them without having to open a separate email and click on a payment link for each invoice. It makes no sense that if a customer has multiple new or overdue invoices outstanding, they need to be sent an individual invoice or invoice reminder email for each one. It also doesn't make sense for QuickBooks users to always have a single invoice with multiple line items as the only alternative. At bare minimum, QuickBooks users should have the ability to choose to send one email to each customer that contains a universal payment link to all outstanding invoices with the ability for recipients/customers to select which ones to pay. An even simpler and helpful solution in the interim would be the ability to send one email with unique payment links aggregated for all outstanding invoices to a customer that is automatically generated. Your product team needs to get on it and do some work on this issue...