Short answer
If a subscription payment fails, Lancer pauses your campaigns so nothing runs on an unpaid plan, and you'll see a payment-failed notice on the Billing page. Update your payment method and your campaigns can resume.
How to fix it
Open Settings → Billing.
Click Manage in Stripe and update your card or payment method.
Once the payment goes through, restart your campaigns (Campaigns → toggle them back on).
Common causes are an expired card, insufficient funds, or a bank declining the charge. If it still won't go through after updating your card, message us.