PlacetoPay Redirection

With this example you will be able to quickly connect with the PlacetoPay Checkout Services.

In order to see more comprehensive examples of how it works, please refer to the examples and the docs page

Authentication

The auth parameter must be sent in all API requests and contains the set of properties needed to verify authentication.

Requirements

To integrate with Checkout you must have your login and secretKey credentials.

login: Site identifier, can be considered public as it travels as plain data in API requests.
secretKey: Secret key of the site, it must be private, from this data a new tranKey will be generated that will be sent in the requests.

These credentials are unique to your site and should be treated securely.

Do not share your credentials in public accessible areas such as Github, client-side code or other places easily to third parties.

How to generate your authentication

You must know and prepare the following information:

Parameter	Description
`login`	Site identifier, credential provided when starting your integration.
`secretKey`	Site secret key, credential provided when starting your integration.
`seed`	This is the date the authentication was generated. Date must be in ISO 8601 format.
`nonce`	Random string value that identifies a request as unique. It is generated and used to create `tranKey` without base64 encoding. When sending it, it must be base64 encoded.
`tranKey`	Generated on every request programmatically. It is generated with the following formulas Base64(SHA-256(nonce + seed + secretKey)).

For this example, a Colombia environment is being used. For more information, see the directory of environments

The CheckoutAuth example class is used as a request parameter in authentication operations. The class includes private methods for cryptographic computations, ensuring the security and confidentiality of the authentication.

data class CheckoutAuth(
    val login: String,
    @Expose(serialize = false)
    private val secretKey: String
) {
    private var nonce: String
    private var seed: String
    private var tranKey: String

    init {
        requireNotNull(login.isNotEmpty()) { "No login provided on authentication" }
        requireNotNull(secretKey.isNotEmpty()) { "No tranKey provided on authentication" }
        val nonceTemp = secureRandom()
        seed = dateInISO()
        tranKey = toBase64(toSHA256(nonceTemp + seed + secretKey))
        nonce = toBase64(nonceTemp.encodeToByteArray())
    }

    private fun secureRandom(): String = BigInteger(130, SecureRandom()).toString()

    private fun dateInISO(): String =
        SimpleDateFormat("yyyy-MM-dd'T'HH:mmZ", Locale.getDefault()).apply {
            timeZone = TimeZone.getTimeZone("America/Bogota")
        }.format(Calendar.getInstance().time)

    private fun toBase64(input: ByteArray): String {
        val encodedBytes: ByteArray =
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
                Base64.getEncoder().encode(input)
            else android.util.Base64.encode(input, android.util.Base64.NO_WRAP)

        return String(encodedBytes)
    }

    private fun toSHA256(input: String): ByteArray =
        MessageDigest.getInstance("SHA-256").digest(input.toByteArray())
}

CheckoutAuth as a parameter in the request body in JSON.

{
    "login": "c51ce410c124a10e0db5e4b97fc2af39",
    "tranKey": "VQOcRcVH2DfL6Y4B4SaK6yhoH/VOUveZ3xT16OQnvxE=",
    "nonce": "NjE0OWVkODgwYjNhNw==",
    "seed": "2023-10-17T16:22-0500"
}

Frequent errors, see the possible errors

Setup services with Retrofit

Create the service interface with Retrofit for the Create Session and Query Session endpoints.

The Retrofit instance must have as baseUrl the environment according to the app version.

Parameters with the @Body must contain the auth parameter of type CheckoutAuth or the data class responsible for authentication.

interface CheckoutService {

    @POST("/api/session")
    suspend fun createSession(
        @Body payment: CheckoutPaymentRequest,
    ): Response<CheckoutPaymentResponse>

    @POST("/api/session/{requestId}")
    suspend fun informationSession(
        @Path("requestId") requestId: String,
        @Body payment: CheckoutInformationRequest,
    ): Response<CheckoutInformationResponse>
    
    ...
}

Create session

Creating a new payment request to obtain a session payment Url.

Just provide the information of the payment needed and you will get a process url if its successful, for this example we are using the Basic Information that needs to be provided, to see the full structure refer to the docs page.

The CheckoutPaymentRequest example class is used as a body request. The class includes the payment, buyer, shipping and other information.

data class CheckoutPaymentRequest(
    val auth: CheckoutAuth,
    val buyer: CheckoutBuyer? = null,
    val cancelUrl: String,
    val captureAddress: Boolean = false,
    val expiration: String,
    val fields: List<CheckoutField>? = null,
    val locale: String,
    val noBuyerFill: Boolean = false,
    val payment: CheckoutPayment,
    val returnUrl: String,
    val ipAddress: String,
    val skipResult: Boolean = false,
    val userAgent: String
)

CheckoutPaymentRequest as a request body in JSON.

See full basic payment

{
  "auth": {
    "login": "c51ce410c124a10e0db5e4b97fc2af39",
    ...
  },
  "expiration": "2023-10-17T23:13-0500",
  "locale": "es_CO",
  "payment": {
    "amount": {
      "currency": "COP",
      "details": [
        {
          "amount": 150000.0,
          "kind": "subtotal"
        },
        ...
      ],
      "total": 165000.0,
      ...
    },
    "buyer": {
      ...
    },
    "items": [
      {
        "category": "Books",
        "name": "Libro antiguo",
        "price": 80000,
        "qty": 1,
        "sku": 302,
        "tax": 15200.0
      },
      ...
    ],
    "reference": "3"
  },
  "returnUrl": "redirection://receipt?return",
  "userAgent": "Mozilla/5.0 (X11; Linux x86_64) Chrome/52.0.2743.116 Safari/537.36 ...",
  ...
}

The CheckoutPaymentResponse example class is used as a response body. The class includes the status, request id and payment Url.

data class CheckoutPaymentResponse(
    val status: CheckoutStatus,
    val requestId: String,
    val processUrl: String,
)

CheckoutPaymentResponse as a response body in JSON.

{
  "status": {
    "status": "OK",
    "reason": "PC",
    "message": "La petición se ha procesado correctamente",
    "date": "2023-10-18T15:02:20-05:00"
  },
  "requestId": 2630139,
  "processUrl": "https://checkout-test.placetopay.com/spa/session/2630139/7149a8cf3..."
}

Query a session

This endpoint allows you to obtain the information of the session, if there are transactions in the session, the details of the same are shown.

The CheckoutInformationRequest example class is used as a body request. The class include auth information.

data class CheckoutInformationRequest(
    val auth: CheckoutAuth,
)

CheckoutInformationRequest as a request body in JSON.

{
  "auth": {
    "login": "c51ce410c124a10e0db5e4b97fc2af39",
    "nonce": "NjE0OWVkODgwYjNhNw==",
    "seed": "2023-10-17T17:13-0500",
    "tranKey": "VQOcRcVH2DfL6Y4B4SaK6yhoH/VOUveZ3xT16OQnvxE="
  }
}

The CheckoutInformationResponse example class is used as a response body. The class includes the status, request id and payment information.

data class CheckoutInformationResponse(
    val status: CheckoutStatus,
    val requestId: String,
    val request: CheckoutPaymentRequest,
    ...
)

CheckoutInformationResponse as a response body in JSON.

See full information response

{
  "requestId": 2630139,
  "status": {
    "status": "APPROVED",
    "reason": "00",
    "message": "La petición ha sido aprobada exitosamente",
    "date": "2023-10-18T15:02:42-05:00"
  },
  "request": {
    "locale": "es_CO",
    "payer": {
      "document": "1040035001",
      ...
    },
    "payment": {
      "reference": "2",
      "amount": {
        "details": [
          {
            "kind": "shipping",
            "amount": 15000
          },
          ...
        ],
        "currency": "COP",
        "total": 65000
      },
      "items": [
        ...
      ],
      ...
    },
    "fields": [
      {
        "keyword": "_processUrl_",
        "value": "https://checkout-test.placetopay.com/spa/session/2630139/7149...",
        "displayOn": "none"
      },
      ...
    ],
    "returnUrl": "redirection://receipt?return",
    "userAgent": "Mozilla/5.0 (X11; Linux x86_64) Chrome/52.0.2743.116 Safari/537.36 ...",
    ...
  },
  "payment": [
    {
      "amount": {
        ...
      },
      "status": {
        "date": "2023-10-18T15:02:39-05:00",
        "status": "APPROVED",
        ...
      },
      "issuerName": "JPMORGAN CHASE BANK, N.A.",
      "paymentMethod": "visa",
      "processorFields": [
        {
          "value": "012988341",
          "keyword": "merchantCode",
          "displayOn": "none"
        },
        ...
      ],
      "paymentMethodName": "Visa",
      ...
    }
  ],
  "subscription": null
}

Settings your WebView

These settings help optimize and customize the browsing experience within the Android application's WebView.

WebView configuration for optimal Web Checkout display

AndroidView(factory = {
        WebView(it).apply {
            settings.javaScriptEnabled = true
            settings.domStorageEnabled = true
            clearCache(true)
            webChromeClient = WebChromeClient()
            webViewClient = object : WebViewClient() {
                ...
            }
            loadUrl(...)
        }
    }, update = {
        it.loadUrl(...)
        ...
    })

Property	Description
`JavaScriptEnabled`	Enables the execution of JavaScript on the loading web page.
`DomStorageEnabled`	Enables web pages to store data locally, which can improve speed and performance.
`ClearCache`	Clears the WebView cache before loading a new URL.
`WebChromeClient` and `WebViewClient`	Configure the WebView's behavior for events such as URL loading and interaction with the page.

Test your credentials

Clone this repository on your local machine.

git clone https://github.com/placetopay-org/checkout-android.git

Open project in Android Studio.
Configure your login, secretKey and urlEnvironment credentials in /app/src/debug/assets/private.properties.
Build and run.

Preview

Libraries

Library	Version
Compose BOM	`androidx.compose:compose-bom:2023.03.00`
View Model	`androidx.lifecycle:lifecycle-viewmodel-compose:2.5.1`
Glide	`com.github.bumptech.glide:compose:1.0.0-alpha.5`
Dagger Hilt	`com.google.dagger:hilt-android:2.44.2`
Hilt Navigation	`androidx.hilt:hilt-navigation-compose:1.0.0`
Retrofit	`com.squareup.retrofit2:retrofit:2.9.0`
Gson Converter	`com.squareup.retrofit2:converter-gson:2.9.0`
Chucker	`com.github.chuckerteam.chucker:library:4.0.0`

Glossary

Name	Description
`login`	Site identifier, it can be considered public because it travels as plain data in API requests.
`secretKey`	Secret key of the site, it must be private, from this data a new `tranKey` will be generated and sent in the request.
`tranKey`	Generated on every request programmatically.
`nonce`	Arbitrary value that identifies a request as unique.
`seed`	This is the date the authentication was generated.
`baseUrl`	Environment URL.

Name		Name	Last commit message	Last commit date
Latest commit History 2 Commits
app		app
examples		examples
gradle/wrapper		gradle/wrapper
images		images
.gitignore		.gitignore
README-es.md		README-es.md
README.md		README.md
build.gradle.kts		build.gradle.kts
gradle.properties		gradle.properties
gradlew		gradlew
gradlew.bat		gradlew.bat
settings.gradle.kts		settings.gradle.kts

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PlacetoPay Redirection

Table of Contents

Integrating Checkout

Sample App

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Authentication

Requirements

How to generate your authentication

Setup services with Retrofit

Create session

Query a session

Settings your WebView

Test your credentials

Preview

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PlacetoPay Redirection

Table of Contents

Integrating Checkout

Sample App

Language

Authentication

Requirements

How to generate your authentication

Setup services with Retrofit

Create session

Query a session

Settings your WebView

Test your credentials

Preview

Libraries

Glossary

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