Is there any difference in domestic and international flight APIs?

The overall booking flow for domestic one-way, international one-way, and international round-trip flights remains the same. In these cases, you receive a single ResultIndex, which is used throughout the booking process.

However, there is a key difference in domestic round-trip and international round-trip handling:

• Domestic Round-Trip:
  The Search API response provides two separate ResultIndex values (for onward and return flights).
  These must be passed as a comma-separated ResultIndex during the booking process in a single request.
• International Round-Trip:
  The Search API response provides a single ResultIndex, where both onward (OB) and inbound (IB) flights are already combined.
  Booking is completed in one step using this single ResultIndex.