1. Overview

Describes methods allows to integration with PayTool solution. Prior to using this solution you have to proceed onboard process. To create account please contact with support.

The PayTool solution provides two integrations models:

  1. SDK - integration with the PayTool’s payment process through the JavaScript library

  2. API - integration with the PayTool’s payment process using the API’s methods and a solution implemented on the merchant side

2. Integration

2.1. SDK

SDK flow

The merchant-paytool.js is a JavaScript-based client-side SDK for Merchant PayTool.
The SDK adds MerchantPayTool class to the global JavaScript scope which can be further instantiated to start PayTool’s payment process. Alternatively, it also defines a custom element called merchant-paytool for a more straightforward, plug-and-play solution.

An optional step is to send a transaction status notification to the Merchant Server. Details of the notification are described in the section: postbacks.

Additionally, the PayTool SDK provides a method that allows you to get transaction details using transactionId.

2.1.1. API Reference

Initialization Add the following script to your website:

<script type="module" src="https://merchant-paytool.verestro.com/merchant-paytool.js"></script>
The type="module" attribute is currently required, because the SDK utilizes modern JavaScript code splitting syntax.

2.1.2. SDK Methods

init

(class approach only)
Starts PayTool’s payment process using the provided data. After successful initialization, resolves a promise and redirects to PayTool’s website. Rejects a promise if any error occurs.

Parameters

Data
Init Data

Returns

Promise<void>

Interfaces
Init Data

Data object passed to PayTool’s backend API.

Name Type Description

apiKey

string

Merchant identifier, given during onboarding.

amount

number

Transaction amount in the lowest unit of money, fe. cents for USD.

currency

string

Transaction currency code.

description

string

Short description of transaction.

redirectUrls

object?

Optional return url object. If not provided, urls from merchant’s config will be used instead.PayTool might append additional query parameters to the urls, fe. a transaction identifier.

redirectUrls.successUrl

string?

The url where users will be redirected after a successful payment.

redirectUrls.failureUrl

string?

The url where users will be redirected after a failed payment.
Examples

The SDK offers different ways to initialize a payment. It can do most of the heavy lifting by itself, including UI, but it also exposes a lower-end API to let you customize your UX.

There are 2 supported approaches:

Class approach

Angular

import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  template: '<button (click)="onClick()">Pay</button>',
})
export class AppComponent {
  payTool = new MerchantPayTool();

  onClick() {
    this.payTool
      .init({
        apiKey: 'YOUR_API_KEY',
        amount: 9999,
        currency: 'CURRENCY_CODE',
        description: 'TRANSACTION_DESCRIPTION',
        redirectUrls: {
          successUrl: 'YOUR_SUCCESS_URL',
          failureUrl: 'YOUR_FAILURE_URL'
        }
      })
      .catch(console.log);
  }
}

React

export const App = () => {
  const payTool = new MerchantPayTool();
  return (
    <button
      onClick={() => {
        payTool
          .init({
            apiKey: 'YOUR_API_KEY',
            amount: 9999,
            currency: 'CURRENCY_CODE',
            description: 'TRANSACTION_DESCRIPTION',
            redirectUrls: {
              successUrl: 'YOUR_SUCCESS_URL',
              failureUrl: 'YOUR_FAILURE_URL'
            }
          })
          .catch(console.log);
      }}>
      Pay
    </button>
  );
};

Plain JavaScript

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <script
      type="module"
      src="https://merchant-paytool.verestro.com/merchant-paytool.js"
    ></script>
  </head>
  <body>
    <button id="pay-btn">Pay</button>
    <script>
      var payButton = document.getElementById('pay-btn');
      payButton.addEventListener('click', function () {
        var payTool = new MerchantPayTool();
        payTool
          .init({
            apiKey: 'YOUR_API_KEY',
            amount: 9999,
            currency: 'CURRENCY_CODE',
            description: 'TRANSACTION_DESCRIPTION',
            redirectUrls: {
              successUrl: 'YOUR_SUCCESS_URL',
              failureUrl: 'YOUR_FAILURE_URL'
            }
          })
          .catch(console.log);
      });
    </script>
  </body>
</html>
Web Component approach

This approach focuses on modern solutions to help your integrate with PayTool as fast as possible and keep your code clean, providing a pre-built "Click to Pay" button. The component accepts data as Init Data, similarly to the init method.

Angular

import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  template: '<merchant-paytool [data]="data"></merchant-paytool>',
})
export class AppComponent {
  data = {
    apiKey: 'YOUR_API_KEY',
    amount: 9999,
    currency: 'CURRENCY_CODE',
    description: 'TRANSACTION_DESCRIPTION',
    redirectUrls: {
      successUrl: 'YOUR_SUCCESS_URL',
      failureUrl: 'YOUR_FAILURE_URL',
    },
  };
}

React@^18

export const App = () => {
  return (
    <merchant-paytool
      ref={el => {
        if (el) {
          el.data = {
            apiKey: 'YOUR_API_KEY',
            amount: 9999,
            currency: 'CURRENCY_CODE',
            description: 'TRANSACTION_DESCRIPTION',
            redirectUrls: {
              successUrl: 'YOUR_SUCCESS_URL',
              failureUrl: 'YOUR_FAILURE_URL'
            }
          };
        }
      }}
    />
  );
};

React@experimental

export const App = () => {
  return (
    <merchant-paytool
      data={{
        apiKey: 'YOUR_API_KEY',
        amount: 9999,
        currency: 'CURRENCY_CODE',
        description: 'TRANSACTION_DESCRIPTION',
        redirectUrls: {
          successUrl: 'YOUR_SUCCESS_URL',
          failureUrl: 'YOUR_FAILURE_URL'
        }
      }}
    />
  );
};

Plain JavaScript

export const App = () => {
  return (
    <merchant-paytool
      data={{
        apiKey: 'YOUR_API_KEY',
        amount: 9999,
        currency: 'CURRENCY_CODE',
        description: 'TRANSACTION_DESCRIPTION',
        redirectUrls: {
          successUrl: 'YOUR_SUCCESS_URL',
          failureUrl: 'YOUR_FAILURE_URL'
        }
      }}
    />
  );
};

2.2. API

API flow

The PayTool API allows you to perform the Paytool’s payment process.

The first step is to initialize the payment using method: PreInitialize. Then, the Merchant Website should redirect the user to the Paytool Website with the transactionId obtained in the first step. Redirect url should build according to schema described in section: Endpoints for PayTool Website. Next step, on the PayTool side the payment process will be executed. When it is finished, the user will be redirected to the address specified by the Merchant in the method: PreInitialize.

An optional step is to send a transaction status notification to the Merchant Server. Details of the notification are described in the section: postbacks.

Additionally, the PayTool API provides a method that allows you to get transaction details using transactionId.

3. Paytool Details

3.1. Endpoints

This section describes the endpoints for PayTool API integration model.

3.1.1. Endpoints for PayTool API

Endpoint for PayTool API contains description of endpoints for Paytool API methods.

Environment

Endpoint

Beta

https://merchant-beta.upaidtest.pl/champion/

Production

https://merchant.upaid.pl/champion/

3.1.2. Endpoints for PayTool Website

Endpoint for PayTool Website contains description of endpoints to which the user should be redirected by Merchant Website to execute the payment process in PayTool.

Path variable: transactionId contains the transaction identifier obtained from the method: PreInitialize.

Environment

Endpoint

Beta

https://merchant-paytool.verestro.dev/{transactionId}

Production

https://merchant-paytool.verestro.com/{transactionId}

3.2. Postbacks

If merchant wants to handle notifications after transactions merchant must create HTTP POST endpoint which will accept requests in format JSON.

Your server after receiving request must return HTTP status 200 OK. Otherwise, server will retry the request.

Request:

POST site.merchant.com/notifications HTTP/1.1
Content-Type: application/json
Content-Length: 265

{
  "transactionId": "3a1e9961-75bc-4279-8791-033c180fa239",
  "status": "DEPOSITED",
  "amount": 100,
  "currency": "USD",
  "description": "description"
}

Request headers:

Type

Value

Constraints

Description

Content-Type

application/json

Required

Content type of request

Request fields

Parameter

Type

Constraints

Description

transactionId

String

Required

Unique Id of transaction

status

String

Required

Transaction status. AUTHORIZED, DEPOSITED, FAILED, UNKNOWN, REFUNDED, REVERSED

amount

Number

Required

Amount for transaction (minor units of currency)

currency

String

Required

Currency of given amount

description

String

Required

Simple description of transaction

Response:

HTTP/1.1 200 OK

Examples:

$ curl 'https://site.merchant.com/notifications' -i -u 'login:password' -X POST -H 'Content-Type: application/json' -d '{

  	"transactionId": "387cd038-fa39-40e1-a6ac-0d610b594787",
    "status": "DEPOSITED",
  	"amount": 100,
  	"currency": "USD",
  	"description": "description",
}'

3.3. Methods

3.3.1. PreInitialize

This method is only required for integration model: PayTool API
Method require authorization with api-key. Value api-key is send in header: X-API-KEY. The API Key is issued to the client during the onboarding process.
The PayTool’s payment process can send post-payment notifications to the Merchant’s server. You can find more information about notifications here: Postbacks
POST [base-url]/web/payment/preInitialize

The method allows to preInitialize PayTool’s payment. The method returns transactionId which will be used step during the process.

Request:

POST /champion/web/payment/preInitialize HTTP/1.1
Content-Type: application/json
X-API-KEY: test_9d102010-f412-4482-be9d-1889aca681c4
Host: merchant.upaid.pl
Content-Length: 312

{
  "amount": 110,
  "currency": "PLN",
  "description": "Simple description of transaction",
  "redirectUrls": {
    "successUrl": "https://successurl.upaid.pl",
    "failureUrl": "https://failureurl.upaid.pl"
  },
  "mid": "4fb7977a-20a8-458c-b9f3-212906b1b9b0",
  "itemId": "itemId",
  "receiverAmount": 100
}

Request headers:

Type

Value

Constraints

Description

Content-Type

application/json

Required

Content type of request

X-API-KEY

55b7fdc7-3d26

Required

API-KEY value

Request fields:

Table 1. Fields for Pre Initialize Transaction
Path Type Constraints Description

amount

Number

Required

Transaction amount

currency

String

Required

Transaction currency

description

String

Required

Simple description of transaction

redirectUrls

Object

Optional

RedirectsUrl Object

redirectUrls.successUrl

String

Optional

The URL where the user will be redirected after successful payment. Can be given during onboarding.

redirectUrls.failureUrl

String

Optional

The URL where the user will be redirected after failure payment. Can be given during onboarding.

mid

String

Optional

Identifier of mid. If not supplied default value will be selected.

itemId

String

Optional

Merchant’s unique id of transaction.

receiverAmount

Number

Optional

Amount without Merchant’s commission

Response:

200 OK
HTTP Response - SUCCESS
HTTP/1.1 200 OK
Content-Length: 62
Content-Type: application/json;charset=UTF-8

{
  "transactionId" : "76b344d9-ea0e-4087-99f5-b51e839e20c1"
}
400 BAD REQUEST
HTTP Response - VALIDATION_ERROR
HTTP/1.1 400 Bad Request
Content-Length: 32
Content-Type: application/json;charset=UTF-8=

{
    "status": "VALIDATION_ERROR",
    "message": "Some fields are invalid",
    "data": [
        {
            "field": "{{field_name_from_request}}",
            "message": "{{message}}"
        }
    ],
    "traceId": "{{traceId}}"
}
422 UNPROCESSABLE ENTITY
HTTP Response - ERROR_ITEM_ID_IS_LOCKED
HTTP/1.1 422 Unprocessable Entity
Content-Length: 32
Content-Type: application/json;charset=UTF-8=

{
    "status": "ERROR_ITEM_ID_IS_LOCKED",
    "message": "ERROR_ITEM_ID_IS_LOCKED",
    "traceId": "{{traceId}}"
}
401 UNAUTHORIZED
HTTP Response - ERROR_BAD_API_KEY
HTTP/1.1 401 Unauthorized
Content-Length: 32
Content-Type: application/json;charset=UTF-8=

{
    "status": "ERROR_BAD_API_KEY",
    "message": "ERROR_BAD_API_KEY",
    "traceId": "{{traceId}}"
}
500 INTERNAL SERVER ERROR
HTTP Response - INTERNAL_SERVER_ERROR
HTTP/1.1 500 Internal Server Error
Content-Length: 32
Content-Type: application/json;charset=UTF-8=

{
    "status": "INTERNAL_SERVER_ERROR",
    "message": "Internal server error exception",
    "traceId": "{{traceId}}"
}

Response fields:

Path Type Description

transactionId

String

Transaction identifier

Examples:

$ curl 'https://merchant.upaid.pl/champion/web/payment/preInitialize' -i -X POST \
    -H 'Content-Type: application/json' \
    -H 'X-API-KEY: test_9d102010-f412-4482-be9d-1889aca681c4' \
    -d '{
  "amount": 110,
  "currency": "PLN",
  "description": "Simple description of transaction",
  "redirectUrls": {
    "successUrl": "https://successurl.upaid.pl",
    "failureUrl": "https://failureurl.upaid.pl"
  },
  "mid": "4fb7977a-20a8-458c-b9f3-212906b1b9b0",
  "itemId": "itemId",
  "receiverAmount": 100
}'

3.3.2. Get transaction details

GET [base-url]/transactions/{transactionId}

Method allows getting transaction details using transactionId. To use this method you need to pass BasicAuth.

Request:

GET /champion/transactions/67fcc5a7-0c8b-4891-abb9-3603b672acf2 HTTP/1.1
Authorization: Basic bG9naW46cGFzc3dvcmQ=
Content-Type: application/json
Host: merchant.upaid.pl

Request headers:

Type

Value

Constraints

Description

Content-Type

application/json

Required

Content type of request

Authorization

Basic bG9naW46cGFzc3dvcmQ=

Required

Basic Authorization token

Response:

200 OK
HTTP Response - SUCCESS
HTTP/1.1 200 OK
Content-Type: application/json;charset=UTF-8
Content-Length: 268

{
  "transactionId" : "67fcc5a7-0c8b-4891-abb9-3603b672acf2",
  "amount" : 100,
  "currency" : "PLN",
  "description" : "description",
  "bin" : "4442211",
  "lastFourDigits" : "1234",
  "status" : "DEPOSITED",
  "threeDsMode" : "FRICTIONLESS",
  "itemId" : "itemId"
}

Response fields:

Path Type Description

transactionId

String

Transaction Id

amount

Number

Transaction amount in pennies

currency

String

Transaction currency

description

String

Transaction description

bin

String

Card bin

lastFourDigits

String

Card last four digits

status

String

Transaction Status. Possible values: DEPOSITED - transaction finished with success INITIALIZED_3DS - transaction during processing FAILED - transaction failed

threeDsMode

String

ThreeDS process mode which informs about

itemId

String

Merchant’s unique id of transaction.
Table 2. Get transaction details errors

Error Status

Http Status

TRANSACTION_NOT_FOUND

400 - Bad Request

Examples:

$ curl 'https://merchant.upaid.pl/champion/transactions/67fcc5a7-0c8b-4891-abb9-3603b672acf2' -i -u 'login:password' -X GET \
    -H 'Content-Type: application/json'