Checkout implementation

Skill appeeky/stripe-skills/skills/checkout-implementation

Implements Stripe payment flows -- Checkout Sessions, Payment Element, subscription signup, and customer reuse. Use when the user wants to "add checkout", "build a payment flow", "integrate Stripe payments", "add a paywall", or "subscription signup". For conversion analysis, see checkout-conversion.From its SKILL.md

Install

npx -y skills add appeeky/stripe-skills --skill checkout-implementation

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SKILL.md

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Checkout Implementation

Builds Stripe payment flows matched to the project stack.

Choose the approach

Need	Use
Fastest, hosted	Stripe Checkout (`checkout.sessions.create`)
Embedded, custom UI	Payment Element + PaymentIntent/SetupIntent
Recurring	subscription mode

Checkout Session essentials

mode: subscription
line_items: price + quantity
customer OR customer_email (reuse existing customer to avoid dupes)
success_url / cancel_url
allow_promotion_codes: true
subscription_data metadata: user_id
automatic_tax enabled (if using Stripe Tax)

Critical rules

Reuse customer: check for existing stripe_customer_id; for plan changes use subscriptions.update (proration), never a 2nd subscription
Pass user_id in metadata for webhook provisioning
Server-side price validation (whitelist price IDs)

Verify

stripe_implementation_planner (MCP) for architecture; test with test cards; confirm via webhook-implementation.