Installing SDK

Install Cyan SDK

npm install @usecyan/sdk

yarn add @usecyan/sdk

Usage

Initialize the SDK instance with an API key, your current web3 provider, and Host URI

import {Cyan} from '@usecyan/sdk'

const apiKey = process.env.CYAN_API_KEY

const provider ... // your web3 provider
const host = 'https://testnet-api.usecyan.com'

const cyan = await Cyan.initiate({apiKey, provider, host})

Method references

configure

This method is responsible for downloading and storing configs from the Cyan API. You need to call this method before starting to use the SDK. However, if you have already initialized the SDK using the initiate method, then there is no need to call this method.

async configure(): Promise<IConfigs>

priceBnplsStep1

Performs the first step of pricing BNPLs and generating options from the response.

async priceBnplsStep1(
	currencyAddress: string,
	items: Array<IItem | IItemWithPrice>
): Promise<{
	items: (IItemWithPrice & { interestRate: number })[];
	options: IOption[];
}>

priceBnplsStep2

Performs the second step of pricing BNPLs. (ICreatePlanParams, IItemWithPrice)

async priceBnplsStep2(args: {
	wallet: string;
	items: IItemWithPrice[];
	option: IOption;
	currencyAddress: string;
	autoRepayStatus: 0 | 1;
}): Promise<Errored<ICreatePlanParams & { isChanged: boolean; marketName: string }>[]>

pricePawnsStep1

Performs the first step of pricing Pawns and generating options from the response. (IItemWithPrice, IOption)

async pricePawnsStep1(
	currencyAddress: string,
	items: Array<IItem | IItemWithPrice>
): Promise<{
	items: (IItemWithPrice & { interestRate: number })[];
	options: IOption[];
}>

pricePawnsStep2

Performs the second step of pricing Pawns. (ICreatePlanParams, IItemWithPrice)

async pricePawnsStep2(args: {
	wallet: string;
	items: IItemWithPrice[];
	option: IOption;
	currencyAddress: string;
	autoRepayStatus: 0 | 1;
}): Promise<Errored<ICreatePlanParams & { isChanged: boolean; marketName: string }>[]>

acceptPlanInfo

Accepts payment plans by signing a typed data message and sending it to the API. (ICreatePlanParams)

async acceptPlans(plans: ICreatePlanParams[]): Promise<void>

checkAndAllowCurrencyForPlan

Checks if the user has allowed the Payment Plan Contract to spend the specified amount of the given currency, and approves it if not.

async checkAndAllowCurrencyForPlan(currencyAddress: string, amount: BigNumber): Promise<void>

getApproval

Approve Payment Plan Contract to spend a specific ERC721 token on behalf of the signer.

async getApproval(address: string, tokenId: string): Promise<void>

createBnpls

Creates BNPL (Buy Now Pay Later) plans by calling the createBNPL function of the payment plan contract. (ICreatePlanParams)

async createBnpls(
	currencyAddress: string, // The address of the currency to use for the BNPL plans.
	plans: ICreatePlanParams[], // An array of objects containing the parameters for each plan to create.
	useOriginalWallet: boolean = true // Whether to pay the downpayment using the original wallet or not (only works for native currency)
): Promise<ContractTransaction>

createPawn

Creates pawn plans by calling the createPawn function of the payment plan contract. (ICreatePlanParams)

async createPawns(plans: ICreatePlanParams[]): Promise<ContractTransaction>

getPaymentInfo

Get the following payment information for a payment plan

async getPaymentInfo(
	plan: IPlan, // The payment plan object
	isEarlyRepayment: boolean = false // Optional flag to indicate if this is early repayment or not
): Promise<{
	payAmountForCollateral: string;
	payAmountForInterest: string;
	payAmountForService: string;
	currentPayment: string;
	dueDate?: Date;
}>

pay

Pays the next payment for a payment plan

async pay(plan: IPlan): Promise<ContractTransaction>

payEarly

Pays all the remaining payment for a payment plan

async payEarly(plan: IPlan): Promise<ContractTransaction>

getUserPlans

Retrieve BNPL or Pawn plans, by user, which are Activated, Funded, or in Pending status.

async getUserPlans(address: string): Promise<IPlan[]>

getCyanWallet

Returns an instance of the CyanWallet contract for the current user.

async getCyanWallet(): Promise<CyanWallet>

createCyanWallet

Creates a new CyanWallet for the current user if it does not exist, or returns the existing one.

async createCyanWallet(): Promise<ContractTransaction>

getPaymentPlanContract

Retrieves the PaymentPlanV2 contract instance for the current chain. (Typically, there is no need to utilize this method. However, if direct interaction with the contract is necessary, invoking this method will provide the currently active instance of PaymentPlanContract.)

async getPaymentPlanContract(): Promise<PaymentPlanV2>