HI,
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1. Update an existing pending order? (changing its: price, sl, tp, amount)
Updating an order is technically a "Cancel/ replace" command that is made in most used technologies and communication protocols. This basically means that you can cancel your previous order and input a new pending one. Identification of the order can be simply made using the comment field available in your "pending open" block.
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2. Cancel selectively a pending order without affecting other orders?
Same as 1 using the comment field or you can sophisticate that using the position ID variable (slightly more complicated to use)
Cheers