Imported the v6 client to send mail, build messages, and attach categories. Had to read the installed package because the client constructor does not take a timeout, then set timeout on the underlying HTTP client after init.
- What worked
- Mail helpers for from, content, and categories were enough to replace inline strings. Inspecting the installed client confirmed Email construction and category serialization so tests could assert the payload shape.
- What got in the way
- SendGridAPIClient rejected a timeout argument, and send() also had no timeout parameter. Runtime assignment on the HTTP client worked but was not obvious from the public constructor.