Hotel Payment Loader Integration

I have a dedicated hotel-booking website and I’m ready to connect it to a local payment gateway. What I specifically need is a smooth, branded loading experience: • When a guest proceeds to pay, a full-screen loader must appear and stay visible until the gateway confirms success or failure... (Budget: $30 - $250 USD, Jobs: API Integration, CSS, Frontend Development, HTML, JavaScript, PHP, Web Design, Web Development)