Biscuits Bundles relies on your themes default add to cart behaviour to successfully add your customers bundle selection to cart. Because of this your theme needs to meet the following criteria to be able to use Biscuits Bundles.
Button requirements
Form requirements
A button within a <form> element OR with a button with a form="" attribute
Button within a <form>
<form method="post" action="/cart/add" id="product-form-template--16334267121855__main" accept-charset="UTF-8" class="form" enctype="multipart/form-data" novalidate="novalidate" data-type="add-to-cart-form">
<input type="hidden" name="id" value="43414054666431" class="product-variant-id">
<button type="submit" name="add" class="product-form__submit button button--full-width button--secondary">Add to cart</button>
</form>Button with a form="" attribute
<form method="post" action="/cart/add" id="product-form-template--16334267121855__main" accept-charset="UTF-8" class="form" enctype="multipart/form-data" novalidate="novalidate" data-type="add-to-cart-form">
</form>
/* Somewhere else on the page */
<button type="submit" id="CartDrawer-Checkout" class="cart__checkout-button button" name="checkout" form="product-form-template--16334267121855__main" disabled=""></button>Form must have an input of name="id" equal to the bundle parent variant id
<form method="post" action="/cart/add" id="product-form-template--16334267121855__main" accept-charset="UTF-8" class="form" enctype="multipart/form-data" novalidate="novalidate" data-type="add-to-cart-form">
<input type="hidden" name="id" value="43414054666431" class="product-variant-id">
</form>2. The submission of the form must include line item properties appended to the form by Biscuits Bundles. This requirement is met by most Shopify theme store themes, if you theme is custom built and you are having issues with add to cart, please check the form submission in network tab includes line item properties.