-> how can it be difficult to track payments? either an invoice is paid or it isn't.

50 clients all making payments on a monthly basis. Reviewing your bank account for payments, marking invoices as paid (harder to differentiate if they are all the same amount). That's a faff. Setting up recurring billing via PayPal with auto-invoice marking as paid removes this.

It looks like Corduroy allows clients to pay for their invoices via credit card online. Is this correct? Can they setup a recurring payment via credit card?

Thanks,