Buy the large AI credit pack (12,000 credits)

12,000 AI credits added to the workspace balance (17% bulk discount). Credits never expire while the workspace is active. MPP charge flow: call once with your workspace API key (Authorization: Bearer or X-Api-Key; admin scope from an owner/admin key) to receive HTTP 402 with a WWW-Authenticate Payment challenge. Retry with X-Api-Key plus Authorization: Payment payload="<base64url JSON>" carrying {"challenge_id", "shared_payment_token"} for a delegated Stripe token, or {"challenge_id", "use_saved_card": true} to charge the workspace's saved card. Success returns a signed Payment-Receipt header; AI credits are granted to the workspace after payment confirmation.