# EMV Transaction Flow ### Flow Chart
#### Sample Flow Code: C\# {% tabs %} {% tab title="Sample 1" %} ``` // #1 MTSCRA m_SCRA = new MTSCRA(); // Delegate the MTSCRA Events. m_SCRA.OnDisplayMessageRequest += OnDisplayMessageRequest; . // Assign parameters. byte timeLimit = 0x3C; byte cardType = 0x07; byte option = 0x00; byte[] amount = new byte[] { 0x00, 0x00, 0x00, 0x00, 0x15, 0x00 }; byte transactionType = 0x00; // Purchase byte[] cashBack = new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; byte[] currencyCode = new byte[] { 0x08, 0x40 }; byte reportingOption = 0x02; // All Status Changes // Start transaction. long result = m_SCRA.startTransaction( timeLimit, cardType, option, amount, transactionType, cashBack, currentCode, reportingOption); ``` {% endtab %} {% tab title="Sample 2" %} ``` // #2 protected void OnDisplayMessageRequest(obj sender, byte[] data) { String message; // Get the message. if (data != NULL) { message = System.Text.Encoding.UTF8.GetString(data); } // A data size of 0 is an instruction to clear the display. if (data.Length == 0) { // Clear the display. } } ``` {% endtab %} {% tab title="Sample 3" %} ``` // #3 protected void OnUserSelectionRequest(object sender, byte[] data) { /* data[0] – selection type data[1] – timeout data[2..n] – remainder contains zero-terminated string items */ // display/retrieve user selection. . // set status and selection result. m_SCRA.setUserSelectionResult(status, selection); } ``` {% endtab %} {% tab title="Sample 4" %} 
// #4

protected void OnARQCReceived(object sender, byte[] data)
{
    /* data[0..1] – ARQC length
    data[2..n] – remainder contains the ARQC TLV object */

    // #4a Forward ARQC to Processor.

    /* An application function to forward the ARQC 
        to a Processor for approval. */
    proccesorResponse = sendARQCToProcesor(data);

    /* No need to send ARQC Response if transaction option 
        had enabled Quick Chip mode. */
    if (isQuickChipEnabled())
    {
    return;
    }


    // #4b Set Acquirer Response.

    // An application function to build Acquirer Response. 
    byte[] response = buildAcquirerResponse(processorResponse);

    // Set Acquirer Response.
    m_SCRA.setAcquirerResponse(response);

}
{% endtab %} {% tab title="Sample 5" %} ``` // #5 protected void OnDisplayMessageRequest(obj sender, byte[] data) { String message; // Get the message. if (data != NULL) { message = System.Text.Encoding.UTF8.GetString(data); } // A data size of 0 is an instruction to clear the display. if (data.Length == 0) { // Clear the display. } } ``` {% endtab %} {% tab title="Sample 6" %} 
// #6

protected void OnTransactionResult(obj sender, byte[] data)
{
    /* data[0]	– Signature Required 
    data[1..2] – Batch Data length
    data[3..n] – remainder contains the Batch Data TLV object */

    // Parse the TLV from data[].
    .
    // Abstract Approval status from TLV tag “DFDF1A”.
    .
    // Abstract Signature Required status from TLV tag data[0].
    .
}
{% endtab %} {% endtabs %} #### Sample Flow Code: Android (Java) {% tabs %} {% tab title="Sample 1" %} ``` // #1 m_MTSCRA = new MTSCRA(this, m_scraHandler); // Assign parameters. byte timeLimit = 0x3C; byte cardType = 0x07; byte option = 0x00; byte[] amount = new byte[] { 0x00, 0x00, 0x00, 0x00, 0x15, 0x00 }; byte transactionType = 0x00; // Purchase byte[] cashBack = new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; byte[] currencyCode = new byte[] { 0x08, 0x40 }; byte reportingOption = 0x02; // All Status Changes // Start transaction. m_MTSCRA.startTransaction( timeLimit, cardType, option, amount, transactionType, cashBack, currencyCode, reportingOption); int result = m_MTSCRA.getResultCode(); ``` {% endtab %} {% tab title="Sample 2" %} ``` // #2 protected void onDisplayMessageRequest(byte[] data) { String message; // Get the message. if (data != NULL) { message = TLVParser.getTextString(data, 0); } // A data size of 0 is an instruction to clear the UI display. if (data.Length == 0) { // Clear the display. } } ``` {% endtab %} {% tab title="Sample 3" %} ``` // #3 protected void onUserSelectionRequest(byte[] data) { /* data[0] – selection type data[1] – timeout data[2..n] – remainder contains user selection strings delimited by “\0”. */ // display/retrieve status and user selection. byte status; byte selection; . . // set status and selection result. m_MTSCRA.setUserSelectionResult(status, selection); } ``` {% endtab %} {% tab title="Sample 4" %} 
// #4
protected void onARQCReceived(byte[] data)
{
    /* data[0..1] – ARQC length
    data[2..n] – remainder contains the ARQC TLV object */

    // #4a Forward ARQC to Processor.

    /* An application function to forward the ARQC 
        to a Processor for approval. */
    proccesorResponse = sendARQCToProcesor(data);

    /* No need to send ARQC Response if transaction option had enabled Quick Chip mode. */
    if (isQuickChipEnabled())
    {
    return;
    }



    // #4b Set Acquirer Response.
    // An application function to build Acquirer Response. 
    byte[] response = buildAcquirerResponse(processorResponse);
    // Set Acquirer Response.
     m_MTSCRA.setAcquirerResponse(response);

}
{% endtab %} {% tab title="Sampel 5" %} 
// #5

protected void onDisplayMessageRequest(byte[] data)
{
    String message;

    // Get the message. 
    if (data != NULL)
    {
        message = TLVParser.getTextString(data, 0);
    }

    // A data size of 0 is an instruction to clear the UI display. 
    if (data.Length == 0)
    {
        // Clear the display.
    }
}
{% endtab %} {% tab title="Sample 6" %} ``` // #6 protected void onTransactionResult(byte[] data) { /* data[0] – Signature Required data[1..2] – Batch Data length data[3..n] – remainder contains the Batch Data TLV object */ // Parse the TLV from data. . // Abstract Approval status from TLV tag “DFDF1A”. . // Abstract Signature Required status from TLV tag data[0]. . } ``` {% endtab %} {% endtabs %} #### Sample Flow Code: iOS {% tabs %} {% tab title="Sample 1" %} ``` // #1 self.mtSCRALib = [[MTSCRA new]; // Delegate the MTSCRA Events. [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(onDisplayMessageRequest:) name:@" onDisplayMessageRequest" withObject:obj]; . . // Assign parameters. Byte timeLimit = 0x3C; Byte cardType = 0x07; Byte option = 0x00; Byte amount[6] = { 0x00, 0x00, 0x00, 0x00, 0x15, 0x00 }; Byte transactionType = 0x00; // Purchase Byte cashBack[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; Byte currencyCode[2] = { 0x08, 0x40 }; Byte reportingOption = 0x02; // All Status Changes // Start transaction. [self.mtSCRALib startTransaction:timeLimit cardType:cardType option:option amount:amount transactionType:transactionType cashBack:cashBack currencyCode:currencyCode reportingOption:reportingOption]; ``` {% endtab %} {% tab title="Sample 2" %} ``` // #2 -(void)OnDisplayMessageRequest:(NSData *)data { // Get the message. NSString* message = [HexUtil stringFromHexString:[self getHexString:data]]; // A data size of 0 is an instruction to clear the display. if (message.Length == 0) { // Clear the display. } } ``` {% endtab %} {% tab title="Sample 3" %} ``` // #3 -(void)OnUserSelectionRequest:(NSData *)data { /* data[0] – selection type data[1] – timeout data[2..n] – remainder contains zero-terminated string items */ // display/retrieve user selection. . // set status and selection result. [self.mtSCRALib.setUserSelectionResult:(Byte)status selection(Byte)userSelection]; } ``` {% endtab %} {% tab title="Sample 4" %} ``` // #4 -(void)OnARQCReceived:(NSData *)data { /* data[0..1] – ARQC length data[2..n] – remainder contains the ARQC TLV object */ // #4a Forward ARQC to Processor. /* An application function to forward the ARQC to a Processor for approval. */ proccesorResponse = sendARQCToProcesor(data); /* No need to send ARQC Response if transaction option had enabled Quick Chip mode. */ if (isQuickChipEnabled()) { return; } // #4b Set Acquirer Response. // An application function to build Acquirer Response. NSData* response = buildAcquirerResponse(processorResponse); // Set Acquirer Response. [self.mtSCRALib.setAcquirerResponse:(unsigned char *)response length:(int)response.length]; } ``` {% endtab %} {% tab title="Sample 5" %} ``` // #5 -(void)OnDisplayMessageRequest:(NSData *)data { // Get the message. NSString* message = [HexUtil stringFromHexString:[self getHexString:data]]; // A data size of 0 is an instruction to clear the display. if (message.Length == 0) { // Clear the display. } } ``` {% endtab %} {% tab title="Sample 6" %} ``` // #6 -(void)OnTransactionResult:(NSData *)data { /* data[0] – Signature Required data[1..2] – Batch Data length data[3..n] – remainder contains the Batch Data TLV object */ // Parse the TLV from data[]. . // Abstract Approval status from TLV tag “DFDF1A”. . // Abstract Signature Required status from TLV tag data[0]. . } ``` {% endtab %} {% endtabs %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://developer.magtek.com/hardware/oem-readers-and-components/oem-readers/odynamo/documentation/programmers-manuals/reader-emv-flowchart/emv-transaction-flow.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.