Fetch BTCPay payment-methods for BTC totals, log API summaries, and
format sender as "Name <email>" via FROM_NAME for Postmark.
Co-authored-by: Cursor <cursoragent@cursor.com>
Send a bannered test transactional email when BTCPay UI test events
arrive instead of failing on a missing invoice API lookup.
Co-authored-by: Cursor <cursoragent@cursor.com>
Replace URL token auth with the official webhook secret signature check.
Add SETUP.md and separate TEST_TOKEN for the Postmark test endpoint.
Co-authored-by: Cursor <cursoragent@cursor.com>