...
commissionfix=!!!commission!!!
mkey={your_api_key}
So the code for Awin would look like
https://marketing.ingenious.cloud/ts/!!!clickRef2!!!/tsa?typ=s&tst=!!!transactionId!!!&trc=default&ctg=sale&sid=affiliatewindow!!!merchantId!!!&cid=!!!transactionId!!!&cli=!!!clickRef!!!&orv=!!!trackedAmount!!!&orc=!!!transactionCurrency!!&commissionfix=!!!commission!!!&mkey={your_api_key}
Again, the tracking domain marketing.ingenious.cloud should be replaced by your tracking domain
...