BLINK PAY SDK for javascript

BlinkPay

Blink Pay sdk provides the core functionality of creating, signing and verifying transaction in order to interact with the Blink API.

Payment structure

interface IPaymentInformation {
    amount: number;
    resourceId: string;
    offerId: string;
    dstAccount: string;
}

The fields inside the IPaymentInformation interface serve the following purpose:

• amount : number - The price of the resource that will be sold
• resourceId: string - A unique identifier of the resource that is being sold
• offerId: string - A secondary identifier used in case a resource that was previously sold needs an update ( e.g the same resource will be sold at different price at a later point )
• dstAccount: string - The address associated with the merchant ( or the addresses where the money will delivered )

interface BlinkPayment {
    paymentInfo: IPaymentInformation;
    paymentInfoSignature: string;
    merchantPublicKey: string;
}

The fields inside the BlinkPayment interface serve the following purpose:

• paymentInfo: IPaymentInformation - Nested field of payment information
• paymentInfoSignature - The signature of the field paymentInfo with the merchant private key
• merchantPublicKey - The public key of the merchant

Signing

For signing the sdk provides the signPayment and signPaymentInformation functions.

signPayment

/**
 * Creates a payment request object following the {IBlinkPayment} format.
 * This object represents a payment request with the given payment information
 * @param {IPaymentInformation} paymentInformation - The resource information ( e.g amount, id, etc. )
 * @param {string} privateKey - The private key of the signer in hexadecimal format
 * @param {string,undefined} publicKey - The public key of signer in hexadecimal format ( optional )
 *
 * @returns {BlinkPayment}
 */
const signPayment = (paymentInformation: IPaymentInformation, privateKey: string, publicKey?: string) : BlinkPayment

signPaymentInformation

/**
 * Creates a payment request object following the {BlinkPayment} format given the payment information explicitly.
 * @param {number} amount - The price of the resource
 * @param {string} destinationAccount - The address associated with the merchant
 *                                      ( or the addresses where the money will delivered )
 * @param {string} resourceId - A unique identifier of the resourced that is being sold
 * @param {string} offerId - A secondary identifier used in case the unique resource need an update
 *                          ( e.g the same resource will be sold at different price at a later point )
 * @param {string} privateKey - The private key of the signer in hexadecimal format
 * @param {string,undefined} publicKey - The public key of signer in hexadecimal format ( optional )
 *
 * @returns {BlinkPayment}
 */
export const signPaymentInformation = (amount: number, destinationAccount: string,
                                       resourceId: string, offerId: string,
                                       privateKey: string, publicKey?: string): BlinkPayment

verifySignedPayment

/**
 * Verify that a payment was signed by the Blink network
 * @param {string} payment - A base64 encoded string that is the payment information sent in the {IBlinkPayment} format.
 * @param {string} paymentSignature - The signature of the payment information with the Blink private key
 * @param {string} blinkPublicKey - The public key of Blink
 *
 * @returns {boolean}
 */
export const verifySignedPayment = (payment: string, paymentSignature: string, blinkPublicKey: string): boolean