First, you should add some variables into your .env file.

PADDLE_VENDOR_ID=...
PADDLE_VENDOR_AUTH_CODE=...
PADDLE_SANDBOX=true

NEXT_PUBLIC_PADDLE_VENDOR_ID=$PADDLE_VENDOR_ID
NEXT_PUBLIC_PADDLE_SANDBOX=$PADDLE_SANDBOX

Next, create a component called PaddleLoader.

import Script from "next/script";

export function PaddleLoader() {
  return (
    <Script
      src="https://cdn.paddle.com/paddle/paddle.js"
      onLoad={() => {
        if (process.env.NEXT_PUBLIC_PADDLE_SANDBOX) {
          Paddle.Environment.set("sandbox");
        }
        Paddle.Setup({
          vendor: Number(process.env.NEXT_PUBLIC_PADDLE_VENDOR_ID),
        });
      }}
    />
  );
}

Next, include PaddleLoader in your page

import { PaddleLoader } from "...";

export default function Page() {
  return (
    <>
      <PaddleLoader />
      <button
        onClick={() => {
          Paddle.Checkout.open({
            product: "...",
          });
        }}
      >
        Buy
      </button>
    </>
  );
}

If you use TypeScript, you should create a file called types.d.ts in the root of your project.

declare global {
  var Paddle: any;
}

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