Friendly reminder
Subject: A quick heads-up about your payment
Hi Alex, I noticed your recent $49.00 payment didn't go through (card declined). No worries at all — these things happen, and it's usually a quick fix. Here's a secure link to update your payment details — it only takes a minute: https://invoice.stripe.com/i/… Once that's done we'll take care of the rest automatically. If anything's unclear, just reply to this email — a real person reads every one. Thanks so much, Your SaaS