Subject lines for subscription renewal notices.
Renewal-reminder subjects should be transparent about what's renewing and when. 'Your {{plan}} renews on {{date}} — $X' is the honest template. Avoid burying the date or the price; renewal surprise erodes trust faster than the price increase itself. For renewal-window upsells ('Upgrade before renewal and lock in this rate'), name the upgrade benefit specifically. Auto-renewal notifications should be sent well in advance (30 days for annual, 7 days for monthly) so the customer has time to act if they want to cancel.
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