diff --git a/Adyen/client.py b/Adyen/client.py
index bcdb266b..28a74ce9 100644
--- a/Adyen/client.py
+++ b/Adyen/client.py
@@ -145,13 +145,14 @@ def _determine_hpp_url(platform, action):
         result = '/'.join([base_uri, service])
         return result
 
-    def _determine_checkout_url(self, platform, action):
+    def _determine_checkout_url(self, platform, action, path_param=None):
         """This returns the Adyen API endpoint based on the provided platform,
         service and action.
 
         Args:
             platform (str): Adyen platform, ie 'live' or 'test'.
             action (str): the API action to perform.
+            path_param Optional[(str)]: a generic id that can be used to modify a payment e.g. paymentPspReference.
         """
         api_version = settings.API_CHECKOUT_VERSION
         if platform == "test":
@@ -171,6 +172,14 @@ def _determine_checkout_url(self, platform, action):
             action = "payments/details"
         if action == "paymentsResult":
             action = "payments/result"
+        if action == "paymentsCancelsWithoutReference":
+            action = "payments/cancels"
+        if action == "paymentsCancelsWithReference":
+            action = f"payments/{path_param}/cancels"
+        if action == "paymentsReversals":
+            action = f"payments/{path_param}/reversals"
+        if action == "payments/Refunds":
+            action = f"payments/{path_param}/refunds"
         if action == "originKeys":
             api_version = settings.API_CHECKOUT_UTILITY_VERSION
         if action == "paymentMethodsBalance":
@@ -437,7 +446,7 @@ class instance.
                                              status_code, headers, message)
         return adyen_result
 
-    def call_checkout_api(self, request_data, action, idempotency_key=None,
+    def call_checkout_api(self, request_data, action, idempotency_key=None, path_param=None,
                           **kwargs):
         """This will call the checkout adyen api. xapi key merchant_account,
         and platform are pulled from root module level and or self object.
@@ -452,6 +461,7 @@ def call_checkout_api(self, request_data, action, idempotency_key=None,
                 https://docs.adyen.com/developers/checkout/api-integration
             service (str): This is the API service to be called.
             action (str): The specific action of the API service to be called
+            path_param (str): This is used to pass the id or referenceID to the API sercie
         """
         if not self.http_init:
             self.http_client = HTTPClient(self.USER_AGENT_SUFFIX,
@@ -520,7 +530,7 @@ def call_checkout_api(self, request_data, action, idempotency_key=None,
         headers = {}
         if idempotency_key:
             headers[self.IDEMPOTENCY_HEADER_NAME] = idempotency_key
-        url = self._determine_checkout_url(platform, action)
+        url = self._determine_checkout_url(platform, action, path_param)
 
         raw_response, raw_request, status_code, headers = \
             self.http_client.request(url, json=request_data,
diff --git a/Adyen/services.py b/Adyen/services.py
index 3c44273a..9bbb45c1 100644
--- a/Adyen/services.py
+++ b/Adyen/services.py
@@ -280,6 +280,13 @@ class AdyenCheckoutApi(AdyenServiceBase):
         payments/details
         originKeys
 
+        Modifications:
+        capture
+        refunds
+        cancels
+        reversals
+
+
     Please refer to the checkout documentation for specifics around the API.
     https://docs.adyen.com/developers/checkout
 
@@ -322,6 +329,42 @@ def payment_result(self, request=None, **kwargs):
         action = "paymentsResult"
         return self.client.call_checkout_api(request, action, **kwargs)
 
+    def payment_captures(self, path_param, request=None, idempotency_key=None, **kwargs):
+        if path_param == "":
+            raise ValueError(
+                'must contain a pspReference in the path_param, path_param cannot be empty'
+            )
+        action = "paymentsCapture"
+        return self.client.call_checkout_api(request, action, path_param, idempotency_key, **kwargs)
+
+    def payments_cancels_without_reference(self, request=None, idempotency_key=None, **kwargs):
+        action = "paymentsCancelsWithoutReference"
+        return self.client.call_checkout_api(request, action, idempotency_key, **kwargs)
+
+    def payments_cancels_with_reference(self, path_param, request=None, idempotency_key=None, **kwargs):
+        if path_param == "":
+            raise ValueError(
+                'must contain a pspReference in the path_param, path_param cannot be empty'
+            )
+        action = "paymentsCancelsWithReference"
+        return self.client.call_checkout_api(request, action, path_param, idempotency_key, **kwargs)
+
+    def payments_reversals(self, path_param, request=None, idempotency_key=None, **kwargs):
+        if path_param == "":
+            raise ValueError(
+                'must contain a pspReference in the path_param, path_param cannot be empty'
+            )
+        action = "paymentsReversals"
+        return self.client.call_checkout_api(request, action, path_param, idempotency_key, **kwargs)
+
+    def payments_refunds(self, path_param, request=None, idempotency_key=None, **kwargs):
+        if path_param == "":
+            raise ValueError(
+                'must contain a pspReference in the path_param, path_param cannot be empty'
+            )
+        action = "paymentsRefunds"
+        return self.client.call_checkout_api(request, action, path_param, idempotency_key, **kwargs)
+
     def origin_keys(self, request=None, **kwargs):
         action = "originKeys"
         return self.client.call_checkout_api(request, action, **kwargs)
diff --git a/README.md b/README.md
index 61973c89..d878a202 100644
--- a/README.md
+++ b/README.md
@@ -1,68 +1,85 @@
 [![Build Status](https://travis-ci.org/Adyen/adyen-python-api-library.svg?branch=master)](https://travis-ci.org/Adyen/adyen-python-api-library)
 [![Coverage Status](https://coveralls.io/repos/github/Adyen/adyen-python-api-library/badge.svg?branch=master)](https://coveralls.io/github/Adyen/adyen-python-api-library?branch=master)
 
-# Adyen APIs Library for Python
-
-This library simplifies working with Adyen APIs and allows you to integrate Adyen
-payments within any Python application.
-
-## Integration
-The Library supports all APIs under the following services:
-
-* checkout
-* checkout utility
-* payments
-* modifications
-* payouts
-* recurring
-
-## Requirements
-
+This is the officially supported Python library for using Adyen's APIs.
+## Integration 
+The library supports all APIs under the following services:
+ 
+* [Checkout API](https://docs.adyen.com/api-explorer/#/CheckoutService/v67/overview): Our latest integration for accepting online payments. Current supported version:  **v67**
+* [Payments API](https://docs.adyen.com/api-explorer/#/Payment/v64/overview): Our classic integration for online payments. Current supported version:  **v64**
+* [Recurring API](https://docs.adyen.com/api-explorer/#/Recurring/v49/overview): Endpoints for managing saved payment details. Current supported version:  **v49**
+* [Payouts API](https://docs.adyen.com/api-explorer/#/Payout/v64/overview): Endpoints for sending funds to your customers. Current supported version:  **v64**
+* [Orders API](https://docs.adyen.com/api-explorer/#/CheckoutService/v67/post/orders): Endpoints for creating and canceling orders. Current supported version:  **v67**
+* [Utility API](https://docs.adyen.com/api-explorer/#/CheckoutService/v67/post/originKeys): This operation takes the origin domains and returns a JSON object containing the corresponding origin keys for the domains. Current supported version:  **v67**
+ 
+For more information, refer to our [documentation](https://docs.adyen.com/) or the [API Explorer](https://docs.adyen.com/api-explorer/).
+ 
+ 
+## Prerequisites
+ 
+-   [Adyen test account](https://docs.adyen.com/get-started-with-adyen)
+-   [API key](https://docs.adyen.com/development-resources/api-credentials#generate-api-key). For testing, your API credential needs to have the [API PCI Payments role](https://docs.adyen.com/development-resources/api-credentials#roles).
 - Python 2.7 or 3.6
 - Packages: requests or pycurl ( optional )
-- Adyen account. If you don't have this you can request it here: https://www.adyen.com/home/discover/test-account-signup#form
+ 
 
-## Installation
+ ## Installation
 
 ### For development propose
 
-Clone this repository and run ```make install```
+Clone this repository and run 
+~~~~ bash 
+make install
+~~~~
 
 ### For usage propose
 
-Use pip command: ```pip install Adyen```
-
-## Usage
-
-Create a class instance of the 'Adyen' class.
-
-```python
+Use pip command: 
+~~~~ bash 
+pip install Adyen
+~~~~
+
+## Using the library
+ 
+ 
+### General use with API key
+ 
+~~~~ python
 import Adyen
 
 ady = Adyen.Adyen()
 
-ady.payment.client.username = "webservice user name"
+ady.payment.client.xapikey = "YourXapikey"
 ady.payment.client.skin_code = "skin code for Hosted Payment pages"
 ady.payment.client.hmac = "HMAC key for skin code"
 ady.payment.client.platform = "test" # Environment to use the library in.
 ady.payment.client.merchant_account = "merchant account name from CA"
-ady.payment.client.password = "webservice user password"
-```
-
-## Documentation
-* https://docs.adyen.com/developers/development-resources/libraries
-* https://docs.adyen.com/developers/checkout
+~~~~
+ 
+### Example integration
+ 
+For a closer look at how our Python library works, clone our [example integration](https://github.com/adyen-examples/adyen-python-online-payments). This includes commented code, highlighting key features and concepts, and examples of API calls that can be made using the library.
 
-## Support
-If you have a feature request, or spotted a bug or a technical problem, create a GitHub issue. For other questions, contact our [support team](https://support.adyen.com/hc/en-us/requests/new?ticket_form_id=360000705420).
 
 ## Contributing
-We strongly encourage you to join us in contributing to this repository so everyone can benefit from:
-* New features and functionality
-* Resolved bug fixes and issues
-* Any general improvements
-
-Read our [**contribution guidelines**](CONTRIBUTING.md) to find out how.
-
+ 
+We encourage you to contribute to this repository, so everyone can benefit from new features, bug fixes, and any other improvements.
+ 
+ 
+Have a look at our [contributing guidelines](https://github.com/Adyen/adyen-python-api-library/blob/develop/CONTRIBUTING.md) to find out how to raise a pull request.
+ 
+ 
+## Support
+If you have a feature request, or spotted a bug or a technical problem, [create an issue here](https://github.com/Adyen/adyen-web/issues/new/choose).
+ 
+For other questions, [contact our Support Team](https://www.adyen.help/hc/en-us/requests/new?ticket_form_id=360000705420).
+ 
+ 
 ## Licence
-MIT license see LICENSE
+This repository is available under the [MIT license](https://github.com/Adyen/adyen-python-api-library/blob/master/LICENSE.md).
+ 
+ 
+## See also
+* [Example integration](https://github.com/adyen-examples/adyen-python-online-payments)
+* [Adyen docs](https://docs.adyen.com/)
+* [API Explorer](https://docs.adyen.com/api-explorer/)
diff --git a/test/CheckoutTest.py b/test/CheckoutTest.py
index 14bec1ab..bffc5526 100644
--- a/test/CheckoutTest.py
+++ b/test/CheckoutTest.py
@@ -236,6 +236,201 @@ def test_payments_result_error_mocked(self):
         self.assertEqual("Invalid payload provided", result.message['message'])
         self.assertEqual("validation", result.message['errorType'])
 
+    def test_payments_cancels_without_reference(self):
+        requests = {
+            "paymentReference": "Payment123",
+            "merchantAccount": "YOUR_MERCHANT_ACCOUNT",
+            "reference": "YourCancelReference",
+        }
+        self.adyen.client = self.test.create_client_from_file(200, requests,
+                                                              "test/mocks/"
+                                                              "checkout/"
+                                                              "paymentscancel-"
+                                                              "withoutreference-succes.json")
+        results = self.adyen.checkout.payments_cancels_without_reference(request=requests)
+        self.assertIsNotNone(results.message['paymentReference'])
+        self.assertEqual("8412534564722331", results.message['pspReference'])
+        self.assertEqual("received", results.message['status'])
+
+    def test_payments_cancels_without_reference_error_mocked(self):
+        requests = {
+            "paymentReference": "Payment123",
+            "merchantAccount": "YOUR_MERCHANT_ACCOUNT",
+            "reference": "YourCancelReference",
+        }
+        self.adyen.client = self.test.create_client_from_file(200, requests,
+                                                              "test/mocks/"
+                                                              "checkout/"
+                                                              "paymentsresult"
+                                                              "-error-invalid-"
+                                                              "data-payload-"
+                                                              "422.json")
+
+        result = self.adyen.checkout.payments_cancels_without_reference(requests)
+        self.assertEqual(422, result.message['status'])
+        self.assertEqual("14_018", result.message['errorCode'])
+        self.assertEqual("Invalid payload provided", result.message['message'])
+        self.assertEqual("validation", result.message['errorType'])
+
+    def test_payments_cancels_success_mocked(self):
+        requests = {"reference": "Your wro order number", "merchantAccount": "YOUR_MERCHANT_ACCOUNT"}
+        reference_id = "8836183819713023"
+        self.adyen.client = self.test.create_client_from_file(200, requests,
+                                                              "test/mocks/"
+                                                              "checkout/"
+                                                              "paymentscancels"
+                                                              "-success.json")
+        result = self.adyen.checkout.payments_cancels_with_reference(request=requests, path_param=reference_id)
+        self.assertEqual(reference_id, result.message["paymentPspReference"])
+        self.assertEqual("received", result.message['status'])
+
+    def test_payments_cancels_error_mocked(self):
+        requests = {"reference": "Your wro order number"}
+        psp_reference = "8836183819713023"
+        self.adyen.client = self.test.create_client_from_file(200, requests,
+                                                              "test/mocks/"
+                                                              "checkout/"
+                                                              "paymentsresult-error-invalid-"
+                                                              "data-payload-422.json")
+        result = self.adyen.checkout.payments_cancels_with_reference(request=requests, path_param=psp_reference)
+        self.assertEqual(422, result.message['status'])
+        self.assertEqual("14_018", result.message['errorCode'])
+        self.assertEqual("Invalid payload provided", result.message['message'])
+        self.assertEqual("validation", result.message['errorType'])
+
+    def test_payments_refunds_success_mocked(self):
+        requests = {
+            "paymentReference": "Payment123",
+            "merchantAccount": "YOUR_MERCHANT_ACCOUNT",
+            "reference": "YourCancelReference",
+        }
+        psp_reference = "Payment123"
+        self.adyen.client = self.test.create_client_from_file(200, requests,
+                                                              "test/mocks/"
+                                                              "checkout/"
+                                                              "paymentscancel-"
+                                                              "withoutreference-succes.json")
+
+        result = self.adyen.checkout.payments_cancels_without_reference(request=requests, path_param=psp_reference)
+        self.assertEqual(psp_reference, result.message["paymentReference"])
+        self.assertIsNotNone(result.message["pspReference"])
+        self.assertEqual("received", result.message['status'])
+
+    def test_payments_refunds_error_mocked(self):
+        requests = {
+            "paymentReference": "Payment123",
+            "merchantAccount": "YOUR_MERCHANT_ACCOUNT",
+            "reference": "YourCancelReference",
+        }
+        reference_id = "Payment123"
+        self.adyen.client = self.test.create_client_from_file(200, requests,
+                                                              "test/mocks/"
+                                                              "checkout/"
+                                                              "paymentsresult-error-invalid-"
+                                                              "data-payload-422.json")
+
+        result = self.adyen.checkout.payments_cancels_without_reference(request=requests, path_param=reference_id)
+        self.assertEqual(422, result.message['status'])
+        self.assertEqual("14_018", result.message['errorCode'])
+        self.assertEqual("Invalid payload provided", result.message['message'])
+        self.assertEqual("validation", result.message['errorType'])
+
+    def test_payments_refunds_raises_vaulue_error(self):
+        requests = {
+            "paymentReference": "Payment123",
+            "merchantAccount": "YOUR_MERCHANT_ACCOUNT",
+            "reference": "YourCancelReference",
+        }
+        self.adyen.client = self.test.create_client_from_file(200, requests,
+                                                              "test/mocks/"
+                                                              "checkout/"
+                                                              "paymentscancel-"
+                                                              "withoutreference-succes.json")
+        with self.assertRaises(ValueError) as exc:
+            self.adyen.checkout.payments_cancels_with_reference(request=requests, path_param="")
+        self.assertEqual(exc.exception.__class__, ValueError)
+        self.assertEqual(exc.exception.__str__(), 'must contain a pspReference in the path_param, path_param cannot '
+                                                  'be empty')
+
+    def test_reversals_success_mocked(self):
+        requests = {
+            "reference": "YourReversalReference",
+            "merchantAccount": "YOUR_MERCHANT_ACCOUNT"
+        }
+        psp_reference = "8836183819713023"
+        self.adyen.client = self.test.create_client_from_file(200, requests,
+                                                              "test/mocks/"
+                                                              "checkout/"
+                                                              "paymentsreversals-"
+                                                              "success.json")
+
+        result = self.adyen.checkout.payments_reversals(request=requests, path_param=psp_reference)
+        self.assertEqual(psp_reference, result.message["paymentPspReference"])
+        self.assertIsNotNone(result.message["pspReference"])
+        self.assertEqual("received", result.message['status'])
+
+    def test_payments_reversals_failure_mocked(self):
+        requests = {
+            "reference": "YourReversalReference",
+            "merchantAccount": "YOUR_MERCHANT_ACCOUNT"
+        }
+        psp_reference = "8836183819713023"
+        self.adyen.client = self.test.create_client_from_file(200, requests,
+                                                              "test/mocks/"
+                                                              "checkout/"
+                                                              "paymentsresult-error-invalid-"
+                                                              "data-payload-422.json")
+
+        result = self.adyen.checkout.payments_reversals(request=requests, path_param=psp_reference)
+        self.assertEqual(422, result.message['status'])
+        self.assertEqual("14_018", result.message['errorCode'])
+        self.assertEqual("Invalid payload provided", result.message['message'])
+        self.assertEqual("validation", result.message['errorType'])
+
+    def test_payments_capture_success_mocked(self):
+        request = {
+          "merchantAccount": "YOUR_MERCHANT_ACCOUNT",
+          "amount": {
+            "value": 2500,
+            "currency": "EUR"
+          },
+          "reference": "YOUR_UNIQUE_REFERENCE"
+        }
+        psp_reference = "8536214160615591"
+        self.adyen.client = self.test.create_client_from_file(200, request,
+                                                              "test/mocks/"
+                                                              "checkout/"
+                                                              "paymentcapture-"
+                                                              "success.json")
+
+        result = self.adyen.checkout.payment_captures(request=request, path_param=psp_reference)
+        self.assertEqual(psp_reference, result.message["paymentPspReference"])
+        self.assertIsNotNone(result.message["pspReference"])
+        self.assertEqual("received", result.message['status'])
+        self.assertEqual(2500, result.message['amount']['value'])
+
+    def test_payments_capture_error_mocked(self):
+        request = {
+            "merchantAccount": "YOUR_MERCHANT_ACCOUNT",
+            "amount": {
+                "value": 2500,
+                "currency": "EUR"
+            },
+            "reference": "YOUR_UNIQUE_REFERENCE"
+        }
+        psp_reference = "8536214160615591"
+        self.adyen.client = self.test.create_client_from_file(200, request,
+                                                              "test/mocks/"
+                                                              "checkout/"
+                                                              "paymentsresult-error-invalid-"
+                                                              "data-payload-422.json")
+
+        result = self.adyen.checkout.payment_captures(request=request, path_param=psp_reference)
+        self.assertEqual(422, result.message['status'])
+        self.assertEqual("14_018", result.message['errorCode'])
+        self.assertEqual("Invalid payload provided", result.message['message'])
+        self.assertEqual("validation", result.message['errorType'])
+
     def test_orders_success(self):
         request = {'merchantAccount': "YourMerchantAccount"}
         self.adyen.client = self.test.create_client_from_file(200, request,
diff --git a/test/mocks/checkout/paymentcapture-success.json b/test/mocks/checkout/paymentcapture-success.json
new file mode 100644
index 00000000..00b019d2
--- /dev/null
+++ b/test/mocks/checkout/paymentcapture-success.json
@@ -0,0 +1,11 @@
+{
+  "merchantAccount": "YOUR_MERCHANT_ACCOUNT",
+  "paymentPspReference": "8536214160615591",
+  "pspReference": "8836226171638872",
+  "reference": "YOUR_UNIQUE_REFERENCE",
+  "status": "received",
+  "amount": {
+    "currency": "EUR",
+    "value": 2500
+  }
+}
\ No newline at end of file
diff --git a/test/mocks/checkout/paymentscancel-withoutreference-succes.json b/test/mocks/checkout/paymentscancel-withoutreference-succes.json
new file mode 100644
index 00000000..744700ce
--- /dev/null
+++ b/test/mocks/checkout/paymentscancel-withoutreference-succes.json
@@ -0,0 +1,7 @@
+{
+    "merchantAccount": "YOUR_MERCHANT_ACCOUNT",
+    "paymentReference": "Payment123",
+    "pspReference" : "8412534564722331",
+    "reference": "YourCancelReference",
+    "status" : "received"
+}
\ No newline at end of file
diff --git a/test/mocks/checkout/paymentscancels-success.json b/test/mocks/checkout/paymentscancels-success.json
new file mode 100644
index 00000000..f9883a90
--- /dev/null
+++ b/test/mocks/checkout/paymentscancels-success.json
@@ -0,0 +1,7 @@
+{
+    "merchantAccount": "YOUR_MERCHANT_ACCOUNT",
+    "paymentPspReference": "8836183819713023",
+    "pspReference" : "8412534564722331",
+    "reference": "Cancel123",
+    "status" : "received"
+}
\ No newline at end of file
diff --git a/test/mocks/checkout/paymentsreversals-success.json b/test/mocks/checkout/paymentsreversals-success.json
new file mode 100644
index 00000000..2503aed0
--- /dev/null
+++ b/test/mocks/checkout/paymentsreversals-success.json
@@ -0,0 +1,7 @@
+{
+    "merchantAccount": "YOUR_MERCHANT_ACCOUNT",
+    "paymentPspReference": "8836183819713023",
+    "pspReference" : "8863534564726784",
+    "reference": "YourReversalReference",
+    "status" : "received"
+}
\ No newline at end of file