An expired customer who was never warned is an angry customer, and quite often a lost one. The plugin warns them for you.
What gets sent, and when
Once a day, the plugin checks who is about to expire and emails them a warning.
How many days in advance depends on the length of the package, and the plugin works this out for you. A yearly package deserves more notice than a weekly one, which is exactly what you would decide by hand.
These are the defaults, which the plugin calls its smart defaults.
Packages of 3 days or less. No warning. There is no point warning someone the day before a three-day package ends; they get the expiry email instead.
Up to 7 days. Warned 1 day before.
Up to 21 days. Warned 2 days before.
Up to 60 days. Warned 5 days before.
Longer than 60 days. Warned 7 days before.
For most agencies, this is simply right, and you never have to think about it.
Changing it, if you want to
There are two ways, and they stack.
For every package at once. Go to Mollie Payments, then the Options tab, and find Subscription and expiry.
There is a setting called Warning email days override (all packages). Leave it empty and the smart defaults apply. Fill in a number and every package uses that instead.
For one package only. Open the package under Real Estate, then Packages, and look in the Mollie Settings block for Expiry warning email.
Fill in a number of days, and this package ignores everything else.
Which setting wins
The order is simple, and it works the way you would hope.
The package setting beats the global setting. The global setting beats the smart defaults.
One sensible safeguard: if you set a warning period longer than the package itself, the plugin quietly falls back to the smart default. Warning someone about an expiry seven days before they have even paid would be strange, so it does not.
Who gets warned
One-time customers get warned before their access ends, because nothing is going to renew by itself. This is the reminder that turns an expiry into a repeat purchase, and it is worth taking seriously.
Subscribers get warned too, and they also get the SEPA pre-notification before each charge.
Do not switch this off
You can, by setting the days to zero. We would rather you did not.
A warning email is the cheapest sales tool you have. It reaches someone who has already paid you once, at the exact moment they are deciding whether to do it again.