Stripe price ID for the project's prepaid-credits top-up SKU.
Resolved server-side from the plan's per-credit overage cost
(e.g. agent_v4 → 10 USDC → 1M credits price). Only present when the
plan exposes prepaid-credits top-ups; absent for FREE / enterprise.
Stripe price ID for the project's prepaid-credits top-up SKU. Resolved server-side from the plan's per-credit overage cost (e.g. agent_v4 → 10 USDC → 1M credits price). Only present when the plan exposes prepaid-credits top-ups; absent for FREE / enterprise.