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Every response includes a status field and a human-readable message. Always branch on status rather than HTTP code alone.

Status values

Example failure

Common errors

Missing or invalid token. Send Authorization: Token <your_api_key> — see Authentication.
Top up your wallet from the dashboard before retrying.
A transaction with that request-id already exists — the original result is returned instead of charging again. Use a fresh request-id for a new purchase.
Check the plan ID / network ID against the catalog endpoints or the dashboard’s Pricing & Plan IDs page.
For pending transactions, never re-send the purchase — wait for the webhook, or re-query using the same request-id.