COOKIE_MUTATION_POLICY_REJECTED

403auth

The browser mutation failed the cookie-session policy.

Cause

The request used a portal cookie without the matching canonical Origin, same-site fetch metadata, and double-submit CSRF token.

How to fix it

Retry from the canonical portal with a fresh session. Never replay or forward portal cookies across origins.

Example response

403 COOKIE_MUTATION_POLICY_REJECTED

JSON

{
  "error_code": "COOKIE_MUTATION_POLICY_REJECTED",
  "error_type": "auth",
  "error_message": "The browser mutation failed the cookie-session policy.",
  "hint": "Retry from the canonical portal with a fresh session. Never replay or forward portal cookies across origins.",
  "docs_url": "https://docs.billerapi.com/errors/COOKIE_MUTATION_POLICY_REJECTED",
  "request_id": "d94f5e2a-8c3b-4f1e-9a7d-6b2c1e0f8a34"
}

Error handling — the error envelope shape and how to parse it
Error code reference — every stable error code

Canonical docs URL: https://docs.billerapi.com/errors/COOKIE_MUTATION_POLICY_REJECTED

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COOKIE_MUTATION_POLICY_REJECTED

Cause

How to fix it

Example response

403 COOKIE_MUTATION_POLICY_REJECTED

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