ottu-py 1.8.0

Python bindings for the Ottu Checkout API

ottu-py

Installation

pip install ottu-py

For Django integration (includes async support):

pip install ottu-py[django]

For async support without Django:

pip install ottu-py[async]

The SDK supports both synchronous and asynchronous operations out of the box.

APIs

Initialization

from ottu import Ottu
from ottu.auth import APIKeyAuth

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key")
)

Instead of APIKeyAuth, you can also use other authentication methods or your own custom auth classes. For more details, see authentication section.

Apart from these merchant_id and auth, you can also pass the customer_id and is_sandbox values. This is used while calling the checkout API and other situations.

from ottu import Ottu
from ottu.auth import APIKeyAuth

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
    customer_id="your-customer-id"
)

APIs

Checkout (aka Session Create)

from ottu import Ottu
from ottu.auth import APIKeyAuth
from ottu.enums import TxnType

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
    customer_id="your-customer-id"
)
response = ottu.checkout(
    txn_type=TxnType.PAYMENT_REQUEST,
    amount="20.23",
    currency_code="KWD",
    pg_codes=["mpgs", "ottu_pg"],
    customer_phone="[phone]",
    order_no="1234567890",
    ...
)
print(response)

Response

{
    "success": true,
    "status_code": 201,
    "endpoint": "/b/checkout/v1/pymt-txn/",
    "response": {
        "amount": "20.230",
        "checkout_url": "https://hotfix.ottu.dev/b/checkout/redirect/start/?session_id=809429a6c912990b195e4e60652436fcae587757",
        "currency_code": "KWD",
        "expiration_time": "00:50:00",
        "session_id": "809429a6c912990b195e4e60652436fcae587757",
        "type": "payment_request",
        ...
    },
    "error": {}
}

You can also access these Session attributes using ottu.session property.

print(ottu.session.session_id)
# 809429a6c912990b195e4e60652436fcae587757

print(ottu.session.checkout_url)
# https://hotfix.ottu.dev/b/checkout/redirect/start/?session_id=809429a6c912990b195e4e60652436fcae587757

It is also possible to use the Session.create(...) to create a new checkout session. That is, ottu.checkout(...) is an aliase for ottu.session.create(...) method.

from ottu import Ottu
from ottu.auth import APIKeyAuth
from ottu.enums import TxnType

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
    customer_id="your-customer-id"
)
response = ottu.session.create(
    txn_type=TxnType.PAYMENT_REQUEST,
    amount="20.23",
    currency_code="KWD",
    pg_codes=["mpgs", "ottu_pg"],
    customer_phone="[phone]",
    order_no="1234567890",
    ...
)
print(response)

Checkout API with dynamic argument(s)

Developers can pass any number of dynamic arguments to the checkout(...) method. The dynamic arguments will be passed to the API as it is.

from ottu import Ottu
from ottu.auth import APIKeyAuth
from ottu.enums import TxnType

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
    customer_id="your-customer-id"
)
response = ottu.checkout(
    txn_type=TxnType.PAYMENT_REQUEST,
    amount="20.23",
    currency_code="KWD",
    pg_codes=["mpgs", "ottu_pg"],
    customer_phone="[phone]",
    order_no="1234567890",

    extra_name="John", # dynamic argument 1
    extra_age="25", # dynamic argument 2
    extra_country="Kuwait", # dynamic argument 3
)
print(response)

Here, extra_name, extra_age, and extra_country are the dynamic arguments which are not supported by the SDK, but may be supported by the API.

### Session Retrieve

```python
from ottu import Ottu
from ottu.auth import APIKeyAuth

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
)
response = ottu.session.retrieve(session_id="your-session-id")
print(response)

Session Update

from ottu import Ottu
from ottu.auth import APIKeyAuth

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
)
response = ottu.session.update(
    session_id="your-session-id",
    amount="1234.23",
)
print(response)

Attachments (Special Case)

You can attach the file to session either while creating the session or updating the session using attachment argument.

attachment argument accepts a string that represents the path to the file.

from ottu import Ottu
from ottu.auth import APIKeyAuth
from ottu.enums import TxnType

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
    customer_id="your-customer-id"
)
ottu.session.create(
    txn_type=TxnType.PAYMENT_REQUEST,
    amount="20.23",
    currency_code="KWD",
    pg_codes=["mpgs", "ottu_pg"],
    customer_phone="[phone]",
    order_no="1234567890",
    attachment="path/to/file.pdf",  # or "/path/to/file.pdf"
)
# update the session with updated attachment
response = ottu.session.update(
    attachment="path/to/file-1234.pdf",  # or "/path/to/file
)
print(response)

Accessing the payment methods

from ottu import Ottu
from ottu.auth import APIKeyAuth
from ottu.enums import TxnType

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
    customer_id="your-customer-id"
)
ottu.session.create(
    txn_type=TxnType.PAYMENT_REQUEST,
    amount="20.23",
    currency_code="KWD",
    pg_codes=["mpgs", "ottu_pg"],
    customer_phone="[phone]",
    order_no="1234567890",
    attachment="path/to/file.pdf",  # or "/path/to/file.pdf"
)
print(ottu.session.payment_methods)

Operations

All operations are performed on the ottu.session object. Also, these methods accept either session_id or order_no as an argument. If session_id is not passed, then it will use the session_id from the ottu.session object.

Cancel

from ottu import Ottu
from ottu.auth import APIKeyAuth

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
)
ottu.session.retrieve(session_id="your-session-id")
response = ottu.session.cancel()
print(response)

To specify the session_id while canceling the session, you can pass the session_id as an argument to the cancel(...) method.

from ottu import Ottu
from ottu.auth import APIKeyAuth

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
)
response = ottu.session.cancel(session_id="your-session-id")
print(response)

To specify the order_no while canceling the session, you can pass the order_no as an argument to the cancel(...) method.

from ottu import Ottu
from ottu.auth import APIKeyAuth

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
)
response = ottu.session.cancel(order_id="your-order-id")
print(response)

Expire

from ottu import Ottu
from ottu.auth import APIKeyAuth

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
)
response = ottu.session.expire(session_id="your-session-id")
print(response)

Delete

from ottu import Ottu
from ottu.auth import APIKeyAuth

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
)
response = ottu.session.delete(session_id="your-session-id")
print(response)

Capture

from ottu import Ottu
from ottu.auth import APIKeyAuth

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
)
response = ottu.session.capture(session_id="your-session-id", amount="20.23", tracking_key="your-tracking-key")
print(response)

Refund

from ottu import Ottu
from ottu.auth import APIKeyAuth

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
)
response = ottu.session.refund(session_id="your-session-id", amount="20.23", tracking_key="your-tracking-key")
print(response)

Void

from ottu import Ottu
from ottu.auth import APIKeyAuth

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
)
response = ottu.session.void(session_id="your-session-id", tracking_key="your-tracking-key")
print(response)

Cards

List all cards for a customer

from ottu import Ottu
from ottu.auth import APIKeyAuth

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
    customer_id="your-customer-id"
)
response = ottu.cards.list()
print(response)

Get latest card for a customer

from ottu import Ottu
from ottu.auth import APIKeyAuth

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
    customer_id="your-customer-id"
)
response = ottu.cards.get()
print(response)

Delete a card for a customer using token

from ottu import Ottu
from ottu.auth import APIKeyAuth

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
    customer_id="your-customer-id"
)
response = ottu.cards.delete(token="your-card-token")
print(response)

Checkout Autoflow

Create a checkout session without specifying the PG codes. The PG codes will be automatically selected based on the currency code, either from the cache or payment method API.

Behind the scenes, ottu-py will automatically fetch the payment methods from the cache or payment method API and select the PG codes based on the currency code.

from ottu import Ottu
from ottu.auth import APIKeyAuth
from ottu.enums import TxnType

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
    customer_id="your-customer-id"
)
response = ottu.checkout_autoflow(
    txn_type=TxnType.PAYMENT_REQUEST,
    amount="20.23",
    currency_code="KWD",
)
print(response)

Auto-debit Autoflow

Completing the auto-debit transaction without specifying the PG codes. The PG codes will be automatically selected based on the currency code from the payment method API. You must pass the value for token that represents the saved card token.

Behind the scenes, ottu-py will automatically fetch the token from the database (only if you use the Django integration) and select the PG codes based on the currency code by calling the payment method API.

from ottu import Ottu
from ottu.auth import APIKeyAuth
from ottu.enums import TxnType

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
    customer_id="your-customer-id"
)
response = ottu.auto_debit_autoflow(
   txn_type=TxnType.PAYMENT_REQUEST,
   amount="20.23",
   currency_code="KWD",
   token="your-card-token",
   agreement={
         "id": "test-agreement-id",
         # other agreement attributes
     },

)
print(response)

Optionally, you can pass the pg_codes to auto_debit_autoflow(...) method. If you pass the pg_codes, then the ottu-py will not call the payment method API to fetch the PG codes.

from ottu import Ottu
from ottu.auth import APIKeyAuth
from ottu.enums import TxnType

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
    customer_id="your-customer-id"
)
response = ottu.auto_debit_autoflow(
   txn_type=TxnType.PAYMENT_REQUEST,
   amount="20.23",
   currency_code="KWD",
   token="your-card-token",
   pg_codes=["ottu_pg"],
   agreement={
      "id": "test-agreement-id",
      # other agreement attributes
   },

)
print(response)

Async Support

The SDK provides full asynchronous support through the OttuAsync class using asgiref.sync.sync_to_async wrapper. This ensures 100% identical behavior between sync and async versions while providing proper async/await support.

Installation

For async support, install with the async extra:

pip install 'ottu-py[async]'

Async support is also automatically included with Django extra.

Basic Async Usage

from ottu import OttuAsync
from ottu.auth import APIKeyAuth
from ottu.enums import TxnType

async def main():
    async with OttuAsync(
        merchant_id="merchant.id.ottu.dev",
        auth=APIKeyAuth("your-secret-api-key"),
        is_sandbox=True
    ) as ottu:
        # Create checkout session
        response = await ottu.checkout(
            txn_type=TxnType.PAYMENT_REQUEST,
            amount="20.23",
            currency_code="KWD",
            pg_codes=["mpgs", "ottu_pg"],
            customer_phone="[phone]",
            order_no="1234567890",
        )
        print(response)

import asyncio
asyncio.run(main())

Async Context Manager

Always use async with when working with OttuAsync to ensure proper cleanup:

async with OttuAsync(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key")
) as ottu:
    # All operations here
    pass

Identical API

Since OttuAsync wraps the sync implementation with sync_to_async, all methods have identical signatures and behavior:

async with OttuAsync(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key")
) as ottu:
    # All sync methods are available as async
    response = await ottu.checkout(...)
    cards = await ottu.cards.list()
    session = await ottu.session.retrieve(session_id="...")
    await ottu.session.capture(session_id="...")

Error Handling

Async operations follow the exact same error handling pattern as sync operations:

async with OttuAsync(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key")
) as ottu:
    response = await ottu.checkout(
        txn_type=TxnType.PAYMENT_REQUEST,
        amount="20.23",
        currency_code="KWD"
    )

    if response.success:
        print(f"Checkout successful: {response.response}")
    else:
        print(f"Checkout failed: {response.error}")

Framework Integration

This async implementation works seamlessly with:

• FastAPI: Install with pip install ottu-py[async] for native async/await support
• Django: Install with pip install ottu-py[django] for Django's async views (includes async support)
• aiohttp: Install with pip install ottu-py[async] for async support
• Any async framework: Standard async/await pattern with pip install ottu-py[async]

Design Principles

• 100% Behavioral Consistency: Uses the same underlying sync code wrapped with sync_to_async
• Zero Code Duplication: No separate async implementation to maintain
• Standard Patterns: Uses Django's proven sync_to_async approach
• Framework Agnostic: Works with any async Python framework

Django Integration

Add ottu.contrib.django to your INSTALLED_APPS setting.

INSTALLED_APPS = [
    ...,
    "ottu.contrib.django",
    ...,
]

Set values for the following settings variables.

Settings

Authentication Settings

OTTU_AUTH - The variable OTTU_AUTH is a dictionary that represents the authentication settings. It should contain mandatory field named class which represents the dotted path to the authentication class. OTTU_AUTH can also contain other fields that are required by the authentication class.

# settings.py

OTTU_AUTH = {
    "class": "ottu.auth.BasicAuth",
    "username": "dj_username",
    "password": "dj_password",
}

OR

# settings.py

OTTU_AUTH = {
    "class": "ottu.auth.APIKeyAuth",
    "api_key": "my-api-key",
}

Other Settings

• OTTU_MERCHANT_ID - Merchant ID (example: merchant.id.ottu.dev)
• OTTU_WEBHOOK_KEY - Webhook Key (example: my-secret-webhook-key)
• OTTU_WEBHOOK_URL - Webhook URL (example: https://your-host.com/path/to/view/)
• OTTU_IS_SANDBOX - Sandbox environment or not (example: True or False). Default is False.

In the case of authentication, it is mandatory to set any set of authentication settings.

Checkout

# any_module.py
from ottu.contrib.django.core.ottu import ottu

response = ottu.checkout(
    txn_type=TxnType.PAYMENT_REQUEST,
    amount="20.23",
    currency_code="KWD",
    pg_codes=["mpgs", "ottu_pg"],
    customer_id="your-customer-id",
    customer_phone="[phone]",
    order_no="1234567890",
    ...
)

Note: The checkout sessions will be automatically saved (and updated if you configure the webhooks) to the database if you use the ottu instance.

Auto-debit Autoflow

Same as Auto-debit Autoflow but it is optional to pass the token. If you don't pass the token, ottu-py will automatically fetch the token from the DB. The token is identified by the customer_id and agreement.id.

from ottu.contrib.django.core.ottu import ottu

response = ottu.auto_debit_autoflow(
      txn_type=TxnType.PAYMENT_REQUEST,
      amount="20.23",
      currency_code="KWD",
      customer_id="your-customer-id",
      agreement={
            "id": "test-agreement-id",
            # other agreement attributes
        },
      ...
)

Webhooks

To accept webhooks, you must set both OTTU_WEBHOOK_KEY and OTTU_WEBHOOK_URL settings variables. Also, you must setup the webhook receiver view that comes with the package.

# views.py
from django.utils.decorators import method_decorator
from django.views.decorators.csrf import csrf_exempt
from ottu.contrib.django.views import WebhookViewAbstractView


@method_decorator(csrf_exempt, name="dispatch")
class WebhookReceiverView(WebhookViewAbstractView):
    pass


# urls.py
from django.urls import path
from .views import WebhookReceiverView

urlpatterns = [
    path("wh-view/", WebhookReceiverView.as_view(), name="wh-view"),
]

Miscellaneous

Authentication

The ottu-py supports a few authentication methods, usually suitable in most of the cases. BasicAuth, APIKeyAuth, KeycloakPasswordAuth and KeycloakClientAuth are the available authentication methods.

• BasicAuth - Basic authentication, using username and password.

  from ottu import Ottu
  from ottu.auth import BasicAuth
  
  ottu = Ottu(
      merchant_id="merchant.id.ottu.dev",
      auth=BasicAuth(
          username="your-username",
          password="your-password"
      )
  )
  

• BasicAuthorizationHeaderAuth - Basic auth setup for header based authentication. You can pass the entireAuthorization header value into the constructor.

  from ottu import Ottu
  from ottu.auth import BasicAuthorizationHeaderAuth
  
  token = "Your-Token-Here"
  ottu = Ottu(
      merchant_id="merchant.id.ottu.dev",
      auth=BasicAuthorizationHeaderAuth(
          header=f"Token {token}"
      )
  )
  

• TokenAuth - Same as BasicAuthorizationHeaderAuth, but, the constructor accepts the token and prefix as separate arguments. This is useful when you want to use a different prefix than Token.

  from ottu import Ottu
  from ottu.auth import TokenAuth
  
  token = "Your-Token-Here"
  ottu = Ottu(
      merchant_id="merchant.id.ottu.dev",
      auth=TokenAuth(
          token=token,
          prefix="Token",
      )
  )
  

• APIKeyAuth - Authentication using API Key. This is also same as TokenAuth but, constructor accepts the api_key instead of token.

  from ottu import Ottu
  from ottu.auth import APIKeyAuth
  
  ottu = Ottu(
      merchant_id="merchant.id.ottu.dev",
      auth=APIKeyAuth(
         api_key="your-api-key"
      )
  )
  

• KeycloakPasswordAuth - Authentication using Keycloak using password grant type.

  from ottu import Ottu
  from ottu.auth import KeycloakPasswordAuth
  
  ottu = Ottu(
      merchant_id="merchant.id.ottu.dev",
      auth=KeycloakPasswordAuth(
           username="your-username",
           password="your-password",
           client_id="your-client-id",
      )
  )
  

  You may also need to supply client_secret if it is required by the Keycloak server.

  from ottu import Ottu
  from ottu.auth import KeycloakPasswordAuth
  
  ottu = Ottu(
      merchant_id="merchant.id.ottu.dev",
      auth=KeycloakPasswordAuth(
          username="your-username",
          password="your-password",
          client_id="your-client-id",
          client_secret="your-client-secret"
      )
  )
  

• KeycloakClientAuth - Authentication using Keycloak using client_credentials grant type.

  from ottu import Ottu
  from ottu.auth import KeycloakClientAuth
  
  ottu = Ottu(
      merchant_id="merchant.id.ottu.dev",
      auth=KeycloakClientAuth(
          client_id="your-client-id",
          client_secret="your-client-secret"
      )
  )
  

Payment Methods

You can call the Ottu.get_payment_methods(...) method to get the available payment methods for the given merchant.

from ottu import Ottu
from ottu.auth import APIKeyAuth

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
)
response = ottu.get_payment_methods(
    plugin="payment_request",
    currencies=["KWD", "USD"],
    customer_id="your-customer-id",
    operation="purchase",
    tokenizable=False,
    pg_names=[]
)
print(response)

Webhook Verification

You can verify the webhook signature using verify_signature(...) function.

from ottu.utils.webhooks import verify_signature

webhook_data_received = {
   "amount":"86.000",
   "currency_code":"KWD",
   "customer_first_name":"example-customer",
   ...,  # other attributes
   "signature":"6143b8ad4bd283540721ab000f6de746e722231aaaa90bc38f639081d3ff9f67"
}
verified = verify_signature(
   payload=webhook_data_received,
   signature=webhook_data_received["signature"], # Usually, signature will be sent along with the webhook data.
   webhook_key=hmac_secret_key_recieved_from_ottu # HMAC Secret Key received from Ottu
)

API Response Structure

All API calls must have the following structure.

{
   "success": true,
   "status_code": 200,
   "endpoint": "/path/to/api/endpoint/",
   "response": {},
   "error": {}
}

• success - Boolean value that represents the success of the API call.
• status_code - HTTP status code of the API call.
• endpoint - API endpoint of the last API call.
• response - Response from the API call.
• error - Error from the API call.

If the call was success, the response field will be present and the error field will be empty, and vice-versa.

In most of the cases, the error will be a JSON object with a key of detail and value of the error message.

{
   "success": false,
   "status_code": 400,
   "endpoint": "/path/to/api/endpoint/",
   "response": {},
   "error": {
      "detail": "Error message"
   }
}

Timeout

You can set the timeout value for all requests made by the SDK. The default value is 30 seconds.

Method 1 - Set the timeout value while initializing the Ottu object.

from ottu import Ottu
from ottu.auth import APIKeyAuth

ottu = Ottu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
    timeout=60 # Set the timeout to 60 seconds
)

Method 2 - Set the timeout value using the timeout property.

from ottu import Ottu
from ottu.auth import APIKeyAuth

class MyOttu(Ottu):
  default_timeout = 50 # Set the default timeout to 50 seconds

ottu = MyOttu(
    merchant_id="merchant.id.ottu.dev",
    auth=APIKeyAuth("your-secret-api-key"),
)

Note: The timeout value set using the timeout parameter will override the value set by the default_timeout attribute.

Test

# Install the dependencies
pip install .[test]

# Run tests
python -m pytest

Release

# do a dry-run first -
bump2version --dry-run --verbose [major|minor|patch]

# if everything looks good, run the following command to release
bump2version --verbose [major|minor|patch]

# push the changes to remote
git push origin master --tags