vPOS Java

This java library helps you easily interact with the vPOS API, Allowing merchants apps/services to request a payment from a client through his/her mobile phone number.

The service currently works for solutions listed below:

EMIS GPO (Multicaixa Express)

Want to know more about how we are empowering merchants in Angola? See our website

Features

• Simple interface
• Uniform plain old objects are returned by all official libraries, so you don't have to serialize/deserialize the JSON returned by our API.

Documentation

Does interacting directly with our API service sound better to you? See our documentation on developer.vpos.ao

Installation

Add the package dependencies to the dependencies element of your project pom.xml file

<dependencies>
  <dependency>
    <groupId>ao.vpos.vpos</groupId>
    <artifactId>vpos</artifactId>
    <version>0.1.1</version>
  </dependency>
</dependencies>

Configuration

This java library requires you set up the following environment variables on your machine before interacting with the API using this library:

Variable	Description	Required
GPO_POS_ID	The Point of Sale ID provided by EMIS	true
GPO_SUPERVISOR_CARD	The Supervisor card ID provided by EMIS	true
MERCHANT_VPOS_TOKEN	The API token provided by vPOS	true
PAYMENT_CALLBACK_URL	The URL that will handle payment notifications	false
REFUND_CALLBACK_URL	The URL that will handle refund notifications	false
VPOS_ENVIRONMENT	The vPOS environment, leave empty for sandbox mode and use "prd" for production.	false

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Create an instance of Vpos (make sure to define the environment variables above to) to interact with our API. The constructor will be responsible for acquiring the tokens defined above to interact with the API.

var merchant = new Vpos();

Note: All Vpos() methods return a common response object called Response.

This type is a wrapper for successful server response.

It has the following methods that allow you to acquire the necessary response data.

Method	Description	Type
getStatusCode()	Get status code from Response	int
getData	Get data from response, if available	T
getMessage()	Get the response message	String
getLocation()	Get the Location of a Transaction, if applicable	String

In the case of an unsuccessful response eg. authorization errors (401), bad request(401) or any other error, an ApiException will be thrown so that your system can handle the error accordingly.

try {
     var response = merchant.newPayment("900111222", "199.99");
} catch (ApiException e) {
    
}

Given you have set up all the environment variables above with the correct information, you will now be able to authenticate and communicate effectively with our API using this library.

The next section will show the various payment actions that can be performed by you, the merchant.

Get all Transactions

This endpoint retrieves all transactions.

var merchant = new Vpos();
var transactions = merchant.getTransactions();

Get a specific Transaction

Retrieves a transaction given a valid transaction ID.

var merchant = new Vpos();
var transaction = merchant.getTransaction("1jHXEbRTIbbwaoJ6w86");

Argument	Description	Type
id	An existing Transaction ID	string

New Payment Transaction

Creates a new payment transaction given a valid mobile number associated with a MULTICAIXA account and a valid amount.

var merchant = new Vpos();
var transaction = merchant.newPayment("900111222", "123.45");

Argument	Description	Type
mobile	The mobile number of the client who will pay	string
amount	The amount the client should pay, eg. "259.99", "259000.00"	string

Request Refund

Given an existing parent_transaction_id, request a refund.

var merchant = new Vpos();
var transaction = merchant.newRefund("1jHXEbRTIbbwaoJ6w86");

Argument	Description	Type
parent_transaction_id	The ID of transaction you wish to refund	string

Poll Transaction Status

Poll the status of a transaction given a valid request_id.

Note: The request_id in this context is essentially the transaction_id of an existing request.

var merchant = new Vpos();
var request = merchant.getRequest("1jHXEbRTIbbwaoJ6w86");

Argument	Description	Type
request_id	The ID of transaction you wish to poll	string

Have any doubts?

In case of any doubts, bugs, or the like, please leave an issue. We would love to help.

License

The library is available as open source under the terms of the MIT License.