Root cause of the persistent sync:flexoptix-catalog HTTP 401: line 397 used
'?? null' which only coerces null/undefined. With FLEXOPTIX_API_TOKEN='' (empty
string set in .env), token stayed '' and line 485's 'token ?? getBearerToken()'
returned '' instead of performing the username/password login — sending an empty
'Bearer ' header that the products endpoint rejected with 401.
Fix: '|| null' coerces empty string to null so the bearer-login fallback fires.
Verified: sync now completes (username/password -> customer token -> products 200,
3 products/price/stock writes on limit=50). Credentials were correct all along.
2432c0ddfc