To launch an OTA website with Booking.com hotel API and Amadeus/TBO flights API in WordPress, you can follow these steps:

1. Choose a WordPress Travel Plugin: Consider using the adivaha WordPress Travel Plugin, which allows you to integrate various APIs, including Booking.com hotel API and Amadeus/TBO flights API. You can find detailed documentation on how to set up the plugin on the adivaha website.

2. API Integration: Start by obtaining API keys from Booking.com, Amadeus, and TBO. These keys will allow your website to communicate with their systems and retrieve hotel and flight data.

3. Install and Configure the Plugin: Install the adivaha WordPress Travel Plugin on your WordPress website. Follow the setup instructions provided in the documentation to configure the plugin with the API keys you obtained.

4. Design and Customize: Customize the look and feel of your OTA website to match your branding. You can use WordPress themes and customization options to create a user-friendly interface for your visitors.

5. Search and Booking Functionality: Implement search and booking functionality on your website. Users should be able to search for hotels and flights using your integrated APIs and make bookings directly through your site.

6. Payment Gateway Integration: Integrate a secure payment gateway such as PayPal or Stripe to facilitate online payments for bookings made on your OTA website.

7. Testing: Thoroughly test your website to ensure that the API integrations are working correctly, and users can search, book, and pay for hotels and flights seamlessly.

8. Launch and Promote: Once everything is set up and tested, launch your OTA website. Promote it through digital marketing channels to attract visitors and drive bookings.

By following these steps and leveraging the adivaha WordPress Travel Plugin, you can successfully launch an OTA website with Booking.com hotel API and Amadeus/TBO flights API integration in WordPress.