Hi there!
I am trying to use some webhooks, and it would be nice to have the possibility to combine it with technical indicators. For example, the position only opens when the webhooks sends a signal but at the same time the market conditions defined by the technical indicator are ok (for example: bullish supertrend).
See you around 
So you want the webhook to become an additional indicator?
If all indicators that are available at Gainium would also be available in your external strategy, that is sending the webhook, you could add them there.
Yes I want the webhook to become a sort of an aditional indicator but I also want to trade through Gainium as it is easier than adding indicators in TradingView. I’m a bad coder and the point of using Gainium is that is an easy to use interface.
So I’m guessing that this should work by adding a new option under technical indicators, which would be a webhook (and maybe the technical indicator should be changed to rules or something more general). Then, when adding the webhook option it creates a payload specifically for that rule, so you can add different webhooks and they all need to be received for the bot to execute the action.
EDIT: yes it could be called “External indicator (webhook)” as mentioned @d_yo_r
It will only be almost impossible to backtest that.
Maybe by using a random signal instead or completely ignoring the webhook?
Not “almost” it will be really impossible. If a webhook condition is added we would need to disable the backtest button as we obviously have no knowledge of what webhooks would have been received in the past.