Integrate Square payment into Shopify

I need Square payment gateway integrated into my shopify website.

The Basic workflow for Shopify Square Integration should be:

Shopify checkout calls out Square custom checkout page through URL redirection
Square collects product information and inventory from the Shopify backend and displays on the checkout page
Collects Billing and Shipping address at the checkout page
Calculates the final cost by dynamically involving the user’s shipping address
Takes card details to complete the checkout
Uses product Id to update the Shopify inventory

below is a link to what I need:
https://www.brihaspatitech.com/blog/square-payment-gateway-development-shopify/

Please make sure to click on the link above read it to understand and then get back to me.

Please send your proposal starting with the word HappyBuds so I know you have read my project