design-price-increase-retentionlisted

# Design Price Increase Retention Direct billing, app stores, and invoices have different notice and consent machines. The no-action default must be explicit. Silence is not consent unless the current contract and channel already say it is, and then the customer-facing copy has to say the same thing. Open [price increase patterns](references/subscription-price-increase-retention-patterns.md) when the channel machine needs depth. Use `price-saas-subscription` for first-time packaging. Use `build-payment-readiness` to implement checkout.