Fix HMAC secret decode for new URL-safe API keys#4
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Add decode_sign_key / decodeSignKey matching api-gw: legacy standard Base64 secrets vs new token_urlsafe secrets. Document signing steps and Pro base URL in README. Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
decode_sign_key(Python) anddecodeSignKey(Java) matching api-gwApiSignatureValidator.decodeSignKey.Invalid Signature (7003)when using keys created after local key generation (URL-safe secrets without+//padding).Test plan
client.pyand call a signed GET (e.g. funding rates).==) still work.