Sure,
This can be done within 2-3 days maximum only.
Can you share,
1 Your website link?
2 Bulk SMS Pack Website link and their API link to set up on site?
3 What message do you like to send to new signup users, do you have the text ready?
4 When to start?
We are in top 10 web designers and developers having skills of WordPress, PHP, CSS, HTML, Javascript, Bootstrap, Jquery, PSD to HTML, PSD to WordPress, Magento, Shopify, eCommerce, Open Cart, Ajax.
Let's discuss further on chat.
Thanks,
Dhruv