決済
Step 1 — Gather context
Buttondown platform help — newsletter publishing, paid subscriptions via Stripe, automations, subscriber management, tags, RSS-to-email, custom domains, Markdown editor, CLI, REST API. Use when Buttondown emails aren't sending, paid subscriptions not working, automation not triggering, subscribers not importing, Stripe payments failing, custom domain not resolving, API calls returning errors, or migrating to Buttondown from another platform. Do NOT use for cross-platform email marketing strategy (use /sales-email-marketing), newsletter monetization strategy (use /sales-newsletter), audience growth strategy (use /sales-audience-growth), or cross-platform deliverability (use /sales-deliverability).