import type { WebhookProvider } from "./index.mjs";
/** SendGrid Event Webhook verifier. SG signs each request with ECDSA
*  (P-256 / SHA-256):
*   - \`X-Twilio-Email-Event-Webhook-Timestamp\`
*   - \`X-Twilio-Email-Event-Webhook-Signature\`
*
*  The signature is over \`\${timestamp}\${body}\` using the account's
*  public verification key (base64 DER). Verified via Web Crypto. */
export interface SendGridWebhookOptions {
	/** Base64-encoded SPKI public key (SendGrid's "Verification Key"). */
	publicKey: string;
	toleranceSeconds?: number;
	now?: () => number;
}
export default function sendgridWebhook(options: SendGridWebhookOptions): WebhookProvider;