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1. Follow the Quickstart guide

Follow the Quickstart guide to create a SaleSnip session.

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2. Create a checkout session

Create a Paddle coupon and checkout session from the SaleSnip negotiation session.
https://api.example.com/checkout
import Decimal from "decimal.js";
import axios from "axios";
import { Paddle } from 'paddle-node-sdk';

const paddle = new Paddle(process.env.PADDLE_API_KEY);

const session = await axios.get(`https://api.salesnip.com/v1/sessions/${req.body.session}`, {
  headers: {
    'X-Api-Key': process.env.SALESNIP_API_KEY,
  },
});

const totalDiscount = session.products.reduce((acc, product) => {
  const initial = new Decimal(product.price.initial);
  const current = new Decimal(product.price.current);

  return acc.plus(initial.minus(current));
}, new Decimal(0));

let discount = null;

if (totalDiscount.gt(0)) {
  discount = await paddle.discounts.create({
    description: `Negotiation Discount`,
    type: 'flat',
    currency_code: session.currency,
    amount: totalDiscount.toFixed(0),
    usage_limit: 1,
  });
}

res.status(200).json({
  products: session.products.map((product) => ({
    priceId: product.id,
    quantity: product.quantity.current,
  })),
  discount: discount.id
});

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3. Open the Paddle checkout

Call your checkout API route to start the Paddle checkout process. 
const res = await fetch("(YOUR_API_URL)/checkout", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    session: data.id,
  }),
});

// TODO: Handle the error
if (!res.ok) throw new Error("Failed to start checkout");
const body = await res.json();

Paddle.Checkout.open({
  items: body.products,
  discountId: body.discount,
  // Other options
});
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