xapi-v2-credits-depleted-returns-402-not-401

When X API v2 calls fail due to zero account credits, the response is HTTP 402 (CreditsDepleted), not 401 or 403. This is a valid authentication — the Bearer Token is correctly accepted. Diagnosing 402 as an auth failure is a false alarm; the fix is purchasing credits on the X Developer Portal dashboard, not rotating the token.