# One-click Checkout / Buy Now

The below function can be used to create a quick checkout link that bring the customer straight to checkout populated with the product variant and selling plan provided.

```javascript
function skioMagicLinkGenerator(productVariantId, sellingPlanId) {
  const magic = {
    products: [
      {
        sellingPlanPlatformId: sellingPlanId,
        productVariantPlatformId: productVariantId
      }
    ]
  }

  const stringifiedMagic = btoa(JSON.stringify(magic))

  return `/a/account/groups/join?magic=${stringifiedMagic}`
}
```

Here is an example of using this with a button element. The variant id and selling plan id are pulled from the add to cart form when the button is clicked so the magic link is dynamically based on the most most recently selected values.

{% code title="button.liquid" %}

```html
<button skio-buy-now {% if form_id %}form="{{ form_id }}"{% endif %}>
  Buy Now
</button>
```

{% endcode %}

{% code title="buy-now\.js" %}

```javascript
const buttonEl = document.querySelector('[skio-buy-now]')
buttonEl.addEventListener('click', (e) => {
  e.preventDefault()
  const formAttr = buttonEl.getAttribute('form')
  const form = document.getElementById(formAttr)
  const formData = new FormData(form)
  let variantId, sellingPlanId
  for ([key, value] of formData.entries()) {
    switch (key) {
      case 'id':
        variantId = value
        break
      case 'selling_plan':
        sellingPlanId = value
        break
    }
  }
  if (variantId && sellingPlanId) {
    window.location.href = skioMagicLinkGenerator(variantId, sellingPlanId)
  }
})
```

{% endcode %}