PHP Base64URL vs Base64 implementation: Troubleshooting for SDK integration

PHP guide for base64url vs base64 implementation in SDK integration: checks, failure modes and no-upload steps. Updated 2026.

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Execution checklist

  1. Validate payload and identify first non-recoverable parser/decoder error.
  2. Normalize format assumptions for PHP and SDK integration workflows.
  3. Apply minimal fix and rerun validation locally without upload.
  4. Capture final runbook in team docs and link to related guide pages.

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