GoPay's Python SDK for Payments REST API

## Requirements

• Python >= 2.6, Python 3
• dependencies: requests

## Installation

The simplest way to install SDK is to use PIP:

pip install gopay

Basic usage

import gopay

# minimal configuration
payments = gopay.payments({
    'goid': 'my goid',
    'clientId': 'my id',
    'clientSecret': 'my secret',
    'isProductionMode': False
})

# full configuration
payments = gopay.payments({
    'goid': 'my goid',
    'clientId': 'my id',
    'clientSecret': 'my secret',
    'isProductionMode': False,
    'scope': gopay.TokenScope.ALL,
    'language': gopay.Language.CZECH,
    'timeout': 30
})

Configuration

Required fields

Required field	Data type	Documentation
goid	string	default GoPay account used in create_payment if target is not specified
clientId	string	https://doc.gopay.com/en/?shell#oauth
clientSecret	string	https://doc.gopay.com/en/?shell#oauth
isProductionMode	boolean	test or production environment?

Optional fields

Optional field	Data type	Default value	Documentation
scope	string	gopay.enums.TokenScope.ALL	https://doc.gopay.com/en/?shell#scope
language	string	gopay.enums.Language.ENGLISH	language used in create_payment if lang is not specified + used for localization of errors
timeout	int	30	Browser timeout in seconds

### Available methods

API	SDK method
Create standard payment	payments.create_payment({})
Status of the payment	payments.get_status(id_payment)
Refund of the payment	payments.refund_payment(id_payment, $amount)
Create recurring payment	payments.create_payment({})
Recurring payment on demand	payments.create_recurrence(id_payment, {})
Cancellation of the recurring payment	payments.void_recurrence(id_payment)
Create pre-authorized payment	payments.create_payment({})
Charge of pre-authorized payment	payments.capture_authorization(id_payment)
Cancellation of the pre-authorized payment	payments.void_authorization(id_payment)

SDK response? Has my call succeed?

SDK returns wrapped API response. Every method returns gopay.http.response object. Structure of json/__str__ should be same as in documentation. SDK throws no exception. Please create an issue if you catch one.

response = payments.create_payment({})
if response.has_succeed():
    print("hooray, API returned " + str(response))
    return response.json['gw_url'] # url for initiation of gateway
else:
    # errors format: https://doc.gopay.com/en/?shell#http-result-codes
    print("oops, API returned " + str(response.status_code) + ": " + str(response))

Method	Description
response.has_succeed()	checks if API returns status code 200
response.json	decoded response, returned objects are converted into associative arrays
response.status_code	HTTP status code
response.__str__()	raw body from HTTP response

### Are required fields and allowed values validated?

No. API validates fields pretty extensively so there is no need to duplicate validation in SDK. It would only introduce new type of error. Or we would have to perfectly simulate API error messages. That's why SDK just calls API which behavior is well documented in doc.gopay.com.

---

Advanced usage

Initiation of the payment gateway

# create payment and pass url to template
response = payments.create_payment({})
if response.has_succeed():
    templateParameters = {
        'gatewayUrl': response.json['gw_url'],
        'embedJs': gopay.url_to_embedjs()
    }
    # render template

Inline gateway

<form action="<%= $gatewayUrl %>" method="post" id="gopay-payment-button">
  <button name="pay" type="submit">Pay</button>
  <script type="text/javascript" src="<%= $embedJs %>"></script>
</form>

Redirect gateway

<form action="<%= $gatewayUrl %>" method="post">
  <button name="pay" type="submit">Pay</button>
</form>

Asynchronous initialization using JavaScript

Enums (Code lists)

Instead of hardcoding bank codes string you can use predefined enums. Check using enums in create-payment example

Type	Description
Language	Payment language, localization of error messages
Token scope	Authorization scope for OAuth2
Payment enums	Enums for creating payment
Response enums	Result of creating payment, executing payment operations

Cache access token

Access token expires after 30 minutes so it's expensive to use new token for every request. Unfortunately it's default behavior of gopay.oauth2.InMemoryTokenCache. But you can implement your cache and store tokens in Memcache, Redis, files, ... It's up to you.

Your cache must implement template methods get_token and set_token. Be aware that there are two scopes (TokenScope) and SDK can be used for different clients (clientId, isProductionMode). So client passed to methods is unique identifier (string) that is built for current environment. Below you can see example implementation of caching tokens in memory:

# register cache in optional service configuration
payments = gopay.payments(
    {}, # your config
    {'cache': MyCache()}
)

class MyCache:
    def __init__(self):
        self.tokens = {}

    def get_token(self, client):
        return self.tokens.get(client) # return None if token not exists

    def set_token(self, client, token):
        self.tokens[client] = token

Log HTTP communication

You can log every request and response from communication with API. Check available loggers below. Or you can implement your own logger, just implement function that takes two arguments: gopay.http.request and gopay.http.response.

# register logger in optional service configuration
payments = gopay.payments(
    {}, # your config
    {'logger': my_logger}
)

def my_logger(request, response):
    print(vars(request))
    print(vars(response))

Available logger	Description
gopay.http.null_logger	Default logger which does nothing
tests.remote.debug_logger	Prints request and response in remote tests

Contributing

Contributions from others would be very much appreciated! Send pull request/ issue. Thanks!

License

Copyright (c) 2015 GoPay.com. MIT Licensed, see LICENSE for details.