export interface SendgridConfig {
    /** SendGrid API key (Bearer secret; typically starts with `SG.`). */
    apiKey: string;
    /** Default sender email address. */
    from: string;
    /** Optional display name composed alongside `from` as `{ email, name }`. */
    senderName?: string;
    /** Optional BYO fetch implementation (defaults to `globalThis.fetch`). */
    fetch?: typeof fetch;
}