The steps, to integrate your Android application with the NetPay SDK, are detailed below:

1. Add repository required.

The implementation of the SDK is through JitPack . This allow us to include remote repositories to our project.

The first step is to add Maven Jitpack to the list of repositories in the root gradle (Project) file.

allprojects {
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}

2. Add dependency information.

The next step is to add the dependency that you want to include on the application in the gradle file (Module: app).

📘
Note
You can check the latest released versions directly from Jitpack the most updated version is 1.1.5.

Example of how to add the dependency with version V1.1.5 is as follows.

dependencies {
    implementation 'com.gitlab.netpaymx.netpay-sdks:smart-sdk:V1.1.5'
}

Demo SDK.

📘
Note
In the following the drive link is attached a Demo SDK ready for download. https://drive.google.com/drive/folders/1nSUJ5yl8afwnyO4_LlmW-IjS4Sk0iOof
This link includes:

APK ready to install DemoSDK-Oficial.apk".

.zip folder with the Demo project "DemoSDK-2023.rar".

3. Import dependencies.

The following dependencies must be imported into your .java or .kt file where the sales operations will be used.

import mx.com.netpay.sdk.SmartApiFactory
import mx.com.netpay.sdk.exceptions.SmartApiException
import mx.com.netpay.sdk.models.*

4. Initialize the SDK.

You must initialize the SDK in order to make use of all available functionality by calling the createSmartApi() method.

In this example we create a constant called smartApi and assign the return value to it.

private val smartApi = SmartApiFactory.createSmartApi(this)

private SmartApi smartApi = SmartApiFactory.INSTANCE.createSmartApi(this);

5. Create SaleRequest object for a sale.

An instance of the SaleRequest class must be created that can receive the following parameters:

Parameter	Parameter type	Description.	Restrictions.
appId	String	Application package name.	*Mandatory
amount	Double	Monto a cobrar, máximo 2 decimales.	*Mandatory
msi	Int	Indicates the number of months to defer the purchase (3, 6, 9, 12, 18).	Optional
tip	Double	Optional amount for tip, maximum 2 decimals.	Optional
folio	String	Transaction identification number that can be sent in the sale request.	*Mandatory

val sale = SaleRequest("mx.com.netpay.demosdk", amount,msi,tip,folio)

SaleRequest sale = new SaleRequest("mx.com.netpay.demosdk", amount, tip,msi, null, null,
                        null, null, folio, null, null, null, null,
                        null, null);

5.1 Implement tipping.

In case of implementing sales with tips, use the following code:

saleButton.setOnClickListener {
  
val folio = folio.text.toString()
val amount = amountTE.text.toString().toDoubleOrNull()?:0.0
val tip = tip.text.toString().toDoubleOrNull()?:0.0
 val msi = msi.text.toString().toIntOrNull()()?:0
val sale = SaleRequest("mx.com.netpay.demosdk", amount, folio = folio,msi = msi, tip = tip)
  
 try {
                smartApi.doTrans(sale)
            } catch (e: SmartApiException) {
                Toast.makeText(this, e.message,Toast.LENGTH_LONG).show()
            }
        }

double amount = Double.parseDouble(amountEt.getText().toString());
double tip =Double.parseDouble(amountEt.getText().toString());
SaleRequest sale = new SaleRequest("mx.com.netpay.demosdk", amount, tip,null, null, null, null, null, null, null, null, null, null,null, null);

📘
Note
To activate the tip option on the Smart PinPad DEV, go to the [settings] section.
https://netpay.readme.io/docs/introducci%C3%B3n-7#configuraci%C3%B3n-de-terminal-optional

6. Create method doTrans() to send a sale.

We can send a request to make the payment through the doTrans() method, which receives the SaleRequest type object created in the previous step as a parameter.

saleButton.setOnClickListener {
  
val folio = folio.text.toString()
val amount = amountTE.text.toString().toDoubleOrNull()?:0.0
val tip = tip.text.toString().toDoubleOrNull()?:0.0
 val msi = msi.text.toString().toIntOrNull()()?:0
val sale = SaleRequest("mx.com.netpay.demosdk", amount, folio = folio,msi = msi, tip = tip)
  
 try {
                smartApi.doTrans(sale)
            } catch (e: SmartApiException) {
                Toast.makeText(this, e.message,Toast.LENGTH_LONG).show()
            }
        }

double amount = Double.parseDouble(amountEt.getText().toString());

                double tip =Double.parseDouble(amountEt.getText().toString());

                SaleRequest sale = new SaleRequest("mx.com.netpay.demosdk", amount, tip,null, null, null,
                        null, null, null, null, null, null, null,
                        null, null);
                smartApi.doTrans(sale);

7. Create ReprintRequest object for Ticket reprint.

In order to reprint the Ticket of a sale made, it is necessary to create an instance of the class
ReprintRequest which receives the following parameters:

Parameter	Parameter type	Description	Restrictions
appId	String	Application package name.	*Mandatory
orderId	String	Number of the order to reprint.	*Mandatory

val sale = ReprintRequest("mx.com.netpay.demosdk", orderId )
try {
    smartApi.doTrans(sale)
} catch (e: SmartApiException) {
    Toast.makeText(this, e.message,Toast.LENGTH_LONG).show()
}

String orderId = orderIdEt.getText().toString();
                ReprintRequest reprintRequest = new ReprintRequest("mx.com.netpay.demosdk", orderId);
                smartApi.doTrans(reprintRequest);

8. Create CancelRequest object to cancel a sale.

If you want to cancel a previously made sale, you need to create a CancelRequest type object, which receives the following as parameters:

Parameter	Parameter type	Description	Restrictions
appId	String	Application package name.	*Mandatory
orderId	String	Number of the order to cancel.	*Mandatory

val sale = CancelRequest("mx.com.netpay.demosdk", orderId )
try {
    smartApi.doTrans(sale)
} catch (e: SmartApiException) {
    Toast.makeText(this, e.message,Toast.LENGTH_LONG).show()
}

String orderId = orderIdEt.getText().toString();
               
CancelRequest voidRequest = new CancelRequest("mx.com.netpay.demosdk", orderId);
smartApi.doTrans(voidRequest);

📘
Note.
You can only cancel a transaction made on the same day, and the cancellation must be requested before 20:00:00 p.m. Mexico City (GMT-5) time.

9. Get the answer.

When the user is done with the subsequent activity and returns, the system calls the activity's onActivityResult() method. This method includes three parameters:
• requestCode (Int) [required]: Request code that was passed to startActivityForResult().
• resultCode (Int) [required]: Result code specified by the second activity. The value will be RESULT_OK in case the transaction is successful. If not, the result will be RESULT_CANCELED, either because the user was removed or the operation failed for some reason.
• data (Intent) [required]: Intent that carries the result data.

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    if(data != null) {
        val response = when(requestCode) {
            Constants.SALE_REQUEST -> smartApi.onResult(requestCode,resultCode,data) as SaleResponse
            Constants.CANCEL_REQUEST -> smartApi.onResult(requestCode,resultCode,data) as CancelResponse
            Constants.REPRINT_REQUEST-> smartApi.onResult(requestCode,resultCode,data) as ReprintResponse
            else -> null
        }
        tvResponse.text = Gson().toJson(response) //TextView para mostrar la respuesta en formato JSON
    }
}

@Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(data != null) {
            BaseResponse response = null;
            switch (requestCode) {
                case Constants.SALE_REQUEST:
                    response = (SaleResponse) smartApi.onResult(requestCode,resultCode,data);
                    break;

                case Constants.CANCEL_REQUEST:
                    response = (CancelResponse) smartApi.onResult(requestCode,resultCode,data);
                    break;

                case Constants.REPRINT_REQUEST:
                    response = (ReprintResponse) smartApi.onResult(requestCode,resultCode,data);

                    break;

                case Constants.PRINT_REQUEST:
                    response = (PrintResponse) smartApi.onResult(requestCode,resultCode,data);
                    break;
            }
            if(response != null) {
                responseTv.setText(new Gson().toJson(response));
            }
        }
    }

[See details of the Sales, Reprint and Cancellation response JSON](https://docs.netpay.com.mx/docs/smart-sdk#12-json-de-respuesta-venta-reimpresi%C3%B3n-y -cancel%C3%B3n).

10. Create PrintRequest object for custom Ticket.

If it is required to implement the print request, the following code can be used:

print.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Create a Page
                IPage page = smartApi.createPage();

                //Create unit containing text and other formats
                IPage.ILine.IUnit unit1 = page.createUnit();
                unit1.setText("Texto 1");
                unit1.setGravity(Gravity.START);

                //2 or more units can be added to a line and it will split into columns
                IPage.ILine.IUnit unit2 = page.createUnit();
                unit2.setText("Texto 2");
                unit2.setGravity(Gravity.END);

                //A line is created and its units are added.
                page.addLine().
                        addUnit(unit1).
                        addUnit(unit2);

                //A new unit is created
                IPage.ILine.IUnit unit3 = page.createUnit();
                unit3.setText("Texto 3");
                unit3.setGravity(Gravity.CENTER);

                //A new line is created and the last unit is added
                page.addLine().addUnit(unit3);

                //A request of the type PrintRequest is created with the package name of the app and the page created
                PrintRequest printRequest = new PrintRequest("mx.com.netpay.demosdk", page);

                smartApi.doTrans(printRequest);
            }
        });

11. Customize the logo on the sales receipt.

Ticket example with an implemented logo.

val page = smartApi.createPage()
                val bm = BitmapFactory.decodeResource(resources,R.drawable.logo_ticket)

                smartApi.doTrans(sale,page,bm)

📘
Note.
The size of the logo must have a maximum height of 100px and a width of 150px. Otherwise it could cause conflict.

12. JSON response Sale, Reprint and Cancellation

{
    "affiliation":" 9352287370",
    "amount":"109.0",
    "authCode":"222222",
    "bin":"376665",
    "cardType":"C",
    "cardTypeName":"AMEX",
    "folioNumber":"prueba1",
    "isRePrint":false,
    "orderId":"200917102306-0820649118",
    "reprintModule":"C", 
    "spanRoute":"1234",
    "transDate":"SEP,17,20 15:10:06",
    "transType":"A",
    "meessage":"Transaccion exitosa",
    "success":true
  }

{
    "autCode":"222222",
    "folioNumber":"prueba1",
    "isRePrint":true,
    "orderId":"200917102306-0820649118",
    "reprintModule":"C", 
    "spanRoute":"8425",
    "transType":"A",
    "meessage":"Transaccion exitosa",
    "success":true
  }

{
    "autCode":"222222",
    "folioNumber":"prueba1",
    "isRePrint":false,
    "orderId":"200917102306-0820649118",
    "reprintModule":"C", 
    "spanRoute":"8425",
    "transType":"V",
    "meessage":"Transaccion exitosa",
    "success":true
  }

Field	Description	Type	Example	Type of transactions to which it applies
success	If the answer is successful, answer with "true" if the answer is declined, answer with "false".	Boolean	Depending on the result: """true"" ""false"""	Sale. Reprint. Cancellation.
message	Message indicating the status of the transaction. You can indicate if it was accepted or declined and for what reason.	String	Depending on the result: """Successful transaction"" ""Connection failed"" ""TRANSACTION REJECTED"	Sale. Reprint. Cancellation.
authCode	Value generated by the authorization authority for an approved transaction.	String	"222222"	Sale. Reprint. Cancellation.
folioNumber	Transaction identification number that can be sent in the sale request.	String	"Test1"
spanRoute	Last 4 digits of the card.	String	"1234"	Sale.
orderId	Transaction number identifier. It can be used later in reprint and cancellation.	String	"200917102306-0820649118"	Sale. Reprint. Cancellation.
folioNumber	Transaction identification number that can be sent in the sale request.	String	Currently not sent in the return response	Sale.
bin	Card bin First 6 digits of the card.	String	"376664"	Sale.
amount	Total amount of the transaction with everything and tip.	String	"109.0"	Sale.
cardTypeName	Represents the name of the card brand type, Visa, Master Card, etc.	String	Depending on the card entered: "AMEX" VISA MASTERCARD	Sale.
affiliation	Business affiliation number.	String	"9352287370"	Sale
transDate	Date and time of the transaction.	String	"SEP,17,20 15:10:06"	Sale
cardType	Card type identifier. Debit (D), Credit (C).	String	"C"	Sale. Reprint. Cancellation.
isRePrint	Value that indicates if the transaction is Reprint "true" and if it is Cancellation or Sale it is "false"	Boolean	Sale and cancellation: "false" Reprint: "true"	Sale. Reprint. Cancellation.
transType	Value that indicates if the transaction is Reprint "true" and if it is Cancellation or Sale it is "false"	String	Sale: "A" Reprint: "A" Cancellation: "V"	Sale. Reprint. Cancellation.
reprintModule	Internal identifier.	String	"C"	Sale. Reprint. Cancellation.

13. Other answers

{
	"bin": "",
	"folioNumber": "",
	"isRePrint": false,
	"message": "TRANSACCION RECHAZADA",
	"success": false
}

{
	"bin": "",
	"folioNumber": "",
	"isRePrint": false,
	"message": "Error de conexión",
	"success": false
}

{
	"bin": "",
	"folioNumber": "",
	"isRePrint": false,
	"message": "Cancelado por el Usuario",
	"success": false
}

{
	"bin": "",
	"folioNumber": "",
	"isRePrint": false,
	"message": "PROMOCION NO VALIDA PARA EL TIPO DE TARJETA",
	"success": false
}