Trading events / methods "hierarchy"

Hello,

What priority is given by the API to the events that occur at the exact same price?
I need to be aware of this to properly control the execution and, so far, this is completely unknown to me.

E.g.:

1. OnTick()
2. OnBar()
3. PendingOrders_Created
4. PendingOrders_Filled
5. PendingOrders_Modified
6. PendingOrders_Cancelled
7. Positions_Opened
8. Positions_Closed
9. Positions_Modified
10. …
11. …
    Etc.

I assume that there must be a specific order here and that priorities are not randomly assigned each time.
Could you please clarify this or, alternatively, indicate / elaborate any specific documentation?

I've already raised this question in the past, however I've never got any effective clarifications.

Thanks in advance!