How to reliably map a closed dealId to its closeLevel (Transaction History vs Activity)

[TAsUjxnMIL]

Hi, I have a question about retrieving the closeLevel for a closed position.

Context

• Positions are opened via POST /positions/otc
• I store the returned dealId
• Later I detect that the position is closed (the dealId no longer appears in open positions)
• At that point I want to determine the closeLevel and whether the position closed via TP or SL

What I’ve observed

• There is no endpoint that allows a direct lookup
  dealId -> closeLevel
• closeLevel is available in Transaction History (/history/transactions)
• However, the transaction reference does not match:
  • the position dealId
  • nor the dealReference used when opening the position
• Account Activity (/history/activity) is not fully reliable for mapping closes:
  • close-related entries are not always present
  • dealReference does not clearly map to transaction reference

Current workaround

I match the correct transaction heuristically using:

• price proximity (openLevel vs entry price)
• time proximity (dateUtc vs local close detection time)
• closeness of closeLevel to known TP / SL levels

This works in practice, but feels like a workaround rather than an intended solution.

Question

Is there an official or deterministic way in the IG API to map a closed dealId to its closeLevel?
Or is heuristic matching (price + time proximity) the expected approach?

Thanks in advance, and thanks for maintaining the library.