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yarn add medusa-payment-paystack

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const plugins = [
  // other plugins
  {
    resolve: `medusa-payment-paystack`,
    /** @type {import("medusa-payment-paystack").PluginOptions} */
    options: {
      secret_key: "<PAYSTACK_SECRET_KEY>",
    },
  },
];

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const { paystackTxRef } = paymentSession.data;

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const paymentForm = document.getElementById("paymentForm");
paymentForm.addEventListener("submit", payWithPaystack, false);

function payWithPaystack(e) {
  e.preventDefault();

  const paystack = new PaystackPop();

  paystack.newTransaction({
    key: "pk_test_xxxxxxxxxx", // Your Paystack public key
    email: document.getElementById("email-address").value,
    amount: document.getElementById("amount").value, // Value in lowest denomination of currency to be paid
    ref: paystackTxRef, // Reference gotten from plugin
    onSuccess() {
      // Call Medusa checkout complete here
    },
    onCancel() {
      alert("Window closed.");
    },
  });
}