Text-only spec
When a user visits the pricing page, they authenticate if needed and select a subscription plan. The backend creates a checkout session through the payment provider API, stores a pending subscription record, and redirects to hosted checkout. On success, a signed webhook verifies the event, updates the user plan tier in the database, writes an order row, and atomically credits the account ledger so that
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Visual graph
User subscribes
Pricing checkout
Stripe API
Checkout + webhooks
25 credits
Added each cycle
25 specs
One credit each
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