Hi, I am available now to start working on it immediately. With 7 years of experience as a full-stack web developer, I possess the skills required to seamlessly integrate Pawapay's API as a payment gateway on your Shopify web application. My expertise includes Shopify development, payment gateway integration, API integration, and web application development. I am confident in delivering a smooth and efficient integration that enhances the shopping experience for your users. Looking forward to discussing the project details further. Best regards, Nazrul Islam