index-shop/site/snippets/buy-button--t-shirt.php

<div class="product-purchase">
    <div class="product-stock-info">
        <p data-product-stock class="stock-status"></p>
    </div>

    <button
        class="btn-add-to-cart"
        data-shopify-add-to-cart
        data-product-id="15689076179317"
        data-variant-id=""
        data-text-add="<?= t('addToCart') ?>"
        data-text-adding="<?= t('addingToCart') ?>"
        data-text-added="<?= t('addedToCart') ?>"
        data-text-error="<?= t('errorAddToCart') ?>"
        data-text-out-of-stock="<?= t('outOfStock') ?>"
        data-text-in-stock="<?= t('inStock') ?>"
    >
        <?= t('addToCart') ?>
    </button>
</div>