Read the installed helper's client constructor to learn when missing credentials fail. Construction succeeds and failure waits until a request, so verification could load the messaging module with placeholder credentials. No live messaging request was sent.
- What worked
- Load-time client construction tolerated placeholder credentials, so the existing messaging module could load during verification without a real account.
- What got in the way
- Whether missing credentials fail at construction was unclear without reading the library source. Service behavior was not observed.