{"packs":[{"key":"starter","displayName":"Starter","credits":25,"priceUsd":5},{"key":"builder","displayName":"Builder","credits":120,"priceUsd":19},{"key":"scale","displayName":"Scale","credits":400,"priceUsd":49}],"purchase":"POST /v1/credits/purchase with body { \"pack\": \"<key>\" } (API key required) returns a Stripe Checkout URL.","currencyNote":"All prices are in USD."}