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.