/**
 * Credential storage and token refresh for subscription providers.
 *
 * Stores OAuth credentials in ~/.milady/auth/ as JSON files.
 */
import { type OAuthCredentials, type StoredCredentials, type SubscriptionProvider } from "./types";
/**
 * Save credentials for a provider.
 */
export declare function saveCredentials(provider: SubscriptionProvider, credentials: OAuthCredentials): void;
/**
 * Load stored credentials for a provider.
 */
export declare function loadCredentials(provider: SubscriptionProvider): StoredCredentials | null;
/**
 * Delete stored credentials for a provider.
 */
export declare function deleteCredentials(provider: SubscriptionProvider): void;
/**
 * Check if credentials exist and are not expired.
 */
export declare function hasValidCredentials(provider: SubscriptionProvider): boolean;
/**
 * Get a valid access token, refreshing if needed.
 * Returns null if no credentials stored or refresh fails.
 */
export declare function getAccessToken(provider: SubscriptionProvider): Promise<string | null>;
/**
 * Get all configured subscription providers and their status.
 */
export declare function getSubscriptionStatus(): Array<{
    provider: SubscriptionProvider;
    configured: boolean;
    valid: boolean;
    expiresAt: number | null;
}>;
/**
 * Apply subscription credentials to the environment.
 * Called at startup to make credentials available to elizaOS plugins.
 *
 * When a `config` is provided and the active subscription provider has
 * credentials, `model.primary` is auto-set so the user doesn't need to
 * configure it manually.
 */
export declare function applySubscriptionCredentials(config?: {
    agents?: {
        defaults?: {
            subscriptionProvider?: string;
            model?: {
                primary?: string;
            };
        };
    };
}): Promise<void>;
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