Whatsapp share protocol

While it’s best to use WhatsApp’s official endpoint for the web, developers are welcome to cancel the default share action after invoking their own action, for example:

a2a_config.callbacks.push({
    share: function(share_data) {
        if (share_data.service === 'WhatsApp') {
            location.href = 'whatsapp://send?text='
                + share_data.title + ' ' + share_data.url;
            return { stop: true };
        }
    }
});