window.addEventListener('DOMContentLoaded', function () {
        
        let distinctId = window.App.mixpanel.get_distinct_id();
        let buyLinks = document.querySelectorAll('[data-buy-button]');

        buyLinks.forEach(item => {
            //append distinct id to the buy link
            item.href = item.href + '&subid5=' + distinctId;

            //check if item.href contains multiple distinct_id params
            if (item.href.includes('&subid5')) {
                let url = new URL(item.href);
                let params = new URLSearchParams(url.search);
                let distinctIds = params.getAll('subid5');
                if (distinctIds.length > 1) {
                    let distinctId = distinctIds[0];
                    params.delete('subid5');
                    params.append('subid5', distinctId);
                    item.href = item.href.split('?')[0] + '?' + params.toString();
                }
            }
        })
                    })