I already have front-end pages for flight search, booking, and payment built in custom PHP. I now need those pages wired to the TravelNDC REST API. The job is straightforward: • Connect my server-side code to TravelNDC endpoints for flight search, flight booking, and payment processing, exchanging data in JSON. • Parse responses and display results on the existing pages without altering their current look and feel. • Handle basic error states and edge cases returned by the API. • Keep sensitive payment data secure and PCI-compliant (use cURL, HTTPS, prepared statements, etc.). • Deliver clean, well-commented PHP so I can maintain it later, plus a short setup note explaining any new variables or keys. All design work is done; I simply need functional API calls and tested workflows end-to-end. If you’ve integrated third-party flight or payment APIs in pure PHP before, this should be quick.