/**
 * Multi-Signature Escrow Service
 *
 * Implements escrow functionality using Substrate's multisig pallet
 * This replaces smart contracts with native Substrate multi-signature accounts
 */
import type { ApiPromise } from '@polkadot/api';
import type { EscrowAccount, MultisigTimepoint } from '../types/escrow.types';
export declare class EscrowService {
    private api;
    constructor(api: ApiPromise);
    /**
     * Create a multi-signature escrow account
     *
     * Creates a 2-of-3 multi-sig account with Buyer, Merchant, and Platform as signatories.
     * This account will hold funds in escrow until release or refund.
     *
     * @param buyer - Buyer's Polkadot address
     * @param merchant - Merchant's Polkadot address
     * @param platform - Platform's Polkadot address (for dispute resolution)
     * @param paymentId - Unique payment identifier
     * @param expirationMinutes - When the escrow expires (default: 60)
     * @returns EscrowAccount with multi-sig address and details
     */
    createMultiSigAccount(buyer: string, merchant: string, platform: string, paymentId: string, expirationMinutes?: number): Promise<EscrowAccount>;
    /**
     * Create a transfer transaction to fund the escrow
     *
     * Buyer calls this to deposit funds into the multi-sig escrow account
     */
    createDepositTransaction(escrowAddress: string, amount: bigint): import("@polkadot/api-base/types").SubmittableExtrinsic<"promise", import("@polkadot/types/types").ISubmittableResult>;
    /**
     * Create a multi-sig transaction to release payment to merchant
     *
     * This initiates a multi-sig call to transfer funds from escrow to merchant.
     * Requires 2 of 3 signatures (typically Buyer + Platform, or Buyer + Merchant).
     *
     * @param escrowAccount - The escrow account details
     * @param merchant - Merchant's address (recipient)
     * @param amount - Amount to release (after platform fee)
     * @param signer - Address of the account initiating this call
     * @param timepoint - Timepoint from previous approval (if this is the 2nd approval)
     */
    createReleaseTransaction(escrowAccount: EscrowAccount, merchant: string, amount: bigint, signer: string, timepoint?: MultisigTimepoint): Promise<import("@polkadot/api-base/types").SubmittableExtrinsic<"promise", import("@polkadot/types/types").ISubmittableResult>>;
    /**
     * Create a multi-sig transaction to refund payment to buyer
     *
     * Similar to release, but sends funds back to the buyer.
     * Typically initiated by Merchant + Platform.
     */
    createRefundTransaction(escrowAccount: EscrowAccount, buyer: string, amount: bigint, signer: string, timepoint?: MultisigTimepoint): Promise<import("@polkadot/api-base/types").SubmittableExtrinsic<"promise", import("@polkadot/types/types").ISubmittableResult>>;
    /**
     * Create a transaction to cancel a multi-sig call
     *
     * Allows a signatory to cancel an initiated multi-sig call before it's executed
     */
    createCancelTransaction(escrowAccount: EscrowAccount, callHash: string, timepoint: MultisigTimepoint, signer: string): Promise<import("@polkadot/api-base/types").SubmittableExtrinsic<"promise", import("@polkadot/types/types").ISubmittableResult>>;
    /**
     * Get balance of escrow account
     */
    getEscrowBalance(escrowAddress: string): Promise<bigint>;
    /**
     * Check if a multi-sig call is pending
     */
    getPendingMultisigCall(escrowAccount: EscrowAccount, callHash: string): Promise<{
        when: MultisigTimepoint;
        depositor: string;
        approvals: string[];
    } | null>;
    /**
     * Calculate platform fee
     *
     * @param amount - Total payment amount
     * @param feeBps - Fee in basis points (e.g., 250 = 2.5%)
     * @returns Fee amount
     */
    calculatePlatformFee(amount: bigint, feeBps?: number): bigint;
    /**
     * Calculate net merchant amount (after platform fee)
     */
    calculateMerchantAmount(amount: bigint, feeBps?: number): bigint;
    /**
     * Validate escrow account structure
     */
    validateEscrowAccount(escrow: EscrowAccount): void;
    /**
     * Check if an address is a signatory of the escrow
     */
    isSignatory(escrowAccount: EscrowAccount, address: string): boolean;
    /**
     * Get the role of an address in the escrow
     */
    getRole(_escrowAccount: EscrowAccount, address: string, buyer: string, merchant: string, platform: string): 'buyer' | 'merchant' | 'platform' | null;
}
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