In the API documentation for "buy", one of the parameters, barrier2 (string) says: "Low barrier for the contract (for contracts with two barriers)..."
What type of contract can likely have 2 barriers?
Ends In/Out - you bet that the price will/won't be between the two barriers at expiration.
Stays In/Goes Out - you bet that the price will/won't stay between the two barriers during the contract's duration.
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