Can i send a manual reminder to a customer?

You can send an instant email reminder to your customer by search for and selecting your customer's invoice.
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Click 'Prepare instant reminder':

The instant reminder uses the Reminder 1 default template and you have the option to amend the template for this specific email.

When you are happy with the template, click the Preview & Send tab:

You will see an option to send a preview to your email address or send directly to your customer. Click 'Send Reminder Now'.

Manual reminders and statements are recorded in the Sent box along with the automated emails.