Whether the token is consumed by its first successful settlement.
True exactly for v3 tokens. A caller that caches an access token must test this before reusing one: settling a spent v3 token fails with BCK.X402.0059 (see isAccessTokenAlreadyUsed).
BCK.X402.0059
The base64-encoded x402 access token
Whether the token is consumed by its first successful settlement.
True exactly for v3 tokens. A caller that caches an access token must test this before reusing one: settling a spent v3 token fails with
BCK.X402.0059(see isAccessTokenAlreadyUsed).