/**
 * Textmagic SMS connector config. Textmagic auth is a two-header pair
 * (`X-TM-Username` + `X-TM-Key`) — distinct from every other wrapped SMS
 * provider's single-header / Basic / Bearer scheme.
 */
export interface TextmagicConfig {
    /** Textmagic account username. */
    username: string;
    /** Textmagic API key (generated in account portal). */
    apiKey: string;
    /** Default sender — alphanumeric or E.164. Per-call overridable via `TextmagicNarrowedInput.from`. */
    from?: string;
    /** BYO `fetch` the wrapper holds no state. */
    fetch?: typeof fetch;
}