カテゴリ分け 識識別⽤用ID付与 各種機能のOn/Off切切替 { "from": {"email": "scott@sendgrid.com"}, "personalization": [{ "to": [{"email": "john@sendgrid.com"}], "substitutions": { "%name%": "John" }, "subject": "Hello John" }, { "to": [{"email": "steve@sendgrid.com"}], "substitutions": { "%name%": "Steve" }, "subject": "Hello Steve" }], "content": [{ "type": "text/plain", "value": "Hello %name%" }, { "type": "text/html", "value": "<h1>Hello %name%</h1>" }] }