How to set Maximum Slippage in mql5 EA

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I am developng EA, I want to set max slippage in mql5, do anyone know how to set max slippage ?
 
Kuldeep Krishnat Konde:
I am developng EA, I want to set max slippage in mql5, do anyone know how to set max slippage ?

For starters, it depends on your broker-dealer's execution policy:

Types of Execution 

Four order execution modes are available in the trading platform:

  • Instant Execution
    In this mode, an order is executed at the price offered to a broker. When sending an order to be executed, the platform automatically adds the current prices to the order. If the broker accepts the prices, the order is executed. If the broker does not accept the requested price, a "Requote" is sent — the broker returns prices, at which this order can be executed.
  • Request Execution
    In this mode, a market order is executed at the price previously received from a broker. Prices for a certain market order are requested from the broker before the order is sent. After the prices have been received, order execution at the given price can be either confirmed or rejected.
  • Market Execution
    In this order execution mode, a broker makes a decision about the order execution price without any additional discussion with a trader. Sending an order in such a mode means advance consent to its execution at this price.
  • Exchange Execution
    In this mode, trade operations conducted in the trading platform are sent to an external trading system (exchange). Trade operations are executed at the prices of current market offers.

Execution mode for each security is defined by the brokerage company.
(https://www.metatrader5.com/en/terminal/help/trading/general_concept#execution_type).


See deviation at:

The Trade Request Structure (MqlTradeRequest)

Interaction between the client terminal and a trade server for executing the order placing operation is performed by using trade requests. The trade request is represented by the special predefined structure of MqlTradeRequest type, which contain all the fields necessary to perform trade deals. The request processing result is represented by the structure of MqlTradeResult type.

struct MqlTradeRequest
  {
   ENUM_TRADE_REQUEST_ACTIONS    action;           // Trade operation type
   ulong                         magic;            // Expert Advisor ID (magic number)
   ulong                         order;            // Order ticket
   string                        symbol;           // Trade symbol
   double                        volume;           // Requested volume for a deal in lots
   double                        price;            // Price
   double                        stoplimit;        // StopLimit level of the order
   double                        sl;               // Stop Loss level of the order
   double                        tp;               // Take Profit level of the order
   ulong                         deviation;        // Maximal possible deviation from the requested price
   ENUM_ORDER_TYPE               type;             // Order type
   ENUM_ORDER_TYPE_FILLING       type_filling;     // Order execution type
   ENUM_ORDER_TYPE_TIME          type_time;        // Order expiration type
   datetime                      expiration;       // Order expiration time (for the orders of ORDER_TIME_SPECIFIED type)
   string                        comment;          // Order comment
   ulong                         position;         // Position ticket
   ulong                         position_by;      // The ticket of an opposite position
  };

(Trade Request Structure - Data Structures - Constants, Enumerations and Structures - MQL5 Reference).

 
Thank you so much :-)
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