Can't auto detect
By default, OnVoard will try to automatically detect checkout button for your store. In rare cases, this may for work for some stores. To resolve this, you can add checkout as id or class to your checkout button HTML element. For example,
<button id="checkout">Checkout</button>
<button class="checkout btn">Checkout</button>
Incompatible with other upsell apps
Initiate checkout trigger may not work if you are using another upsell app that modifies checkout button behavior. In this case, try disabling other upsell apps for your store.