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Troubleshooting
4 posts in this collection.
4 reviewed guides
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Migration GuideMarch 10, 2026
Magento USPS AC-15210: Apply the Patch, Then Fix the Three Things It Leaves Broken
AC-15210 is Adobe's official USPS REST patch, not an unfixed bug. How to apply it, the config.xml error it ships with, and the gaps it leaves behind.
9 min readBreaking ChangeMarch 10, 2026
USPS API Rate Limits in 2026: From 6,000/min to 60/hour
USPS v3 throughput fell from roughly 6,000 requests a minute on Web Tools to 60 per hour. What that does to checkout at peak, and five architecture patterns.
12 min readOnboardingMarch 10, 2026
How to Get a USPS CRID and MID, and Link Them to the v3 API (2026)
A USPS CRID identifies the business; a MID identifies the mailer. Here is where to find them, connect the EPA, link COP claims, and activate v3 APIs.
16 min readTroubleshootingMarch 10, 2026
USPS v3 OAuth Troubleshooting: Every Error and How to Fix It
401, 403, and 429 from USPS v3, with the exact fix for each, including the Addresses API license that has gated address calls since August 1, 2026.
9 min read