There are a few ways you can request a payment chase for a client's unpaid invoice(s). The first option is when booking an appointment for your client. at the bottom, there will be an option to request online payment which, when booked will send a payment link to the patient

Another option is to do it from the invoice itself, if you go to either the Finance section of E-Clinic and search for the patient's invoice(s). Alternatively you go onto the patient's record and click finance then View to access the invoice from there. Once on the invoice click, 'pay inovice' then 'Rquest payment online ' as shown here this will send a chase or if the patients card is alreadys saved it will automatically take the payment out:
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