...
We have added an additional optional parameter ‘marketVersion’ to the ‘placeOrders’ and ‘replaceOrders’ operations. The MarketBook data item, which contains the dynamic data on a market, including its prices, has always been returned an integer market ‘version’. This ‘version’ is incremented when significant events – runner removal, turn in-play etc. – occur. Now, by passing that version as ‘marketVersion’ with your orders, you can specify that if the market version has been incremented beyond that value, your orders should lapse and not be submitted for matching.
...
If alternatively you should wish to benefit by receiving the same potential payout as you originally requested, but to smaller stakes, you can now specify on a LimitOrder an optional ‘betTargetType’ of ‘PAYOUT’ or ‘BACKERS_PROFIT’ (the latter being identical to layers’ liability) and a ‘betTargetSize’ representing the value of that payout or profit, together with the usual ‘price’ parameter to represent their limit price. Your bet will then be matched to achieve that payout or profit at the specified price or better.
...