Add helper to fetch subscription payments

lib/mollie/client.rb

@@ -62,7 +62,12 @@ def add_version_string(version_string)
     end
 
     def perform_http_call(http_method, api_method, id = nil, http_body = {}, query = {})
-      path         = "/#{API_VERSION}/#{api_method}/#{id}".chomp('/')
+      path = if api_method.start_with?(API_ENDPOINT)
+        URI.parse(api_method).path
+      else
+        "/#{API_VERSION}/#{api_method}/#{id}".chomp('/')
+      end
+
       api_key      = http_body.delete(:api_key) || query.delete(:api_key) || @api_key
       api_endpoint = http_body.delete(:api_endpoint) || query.delete(:api_endpoint) || @api_endpoint
 

lib/mollie/customer/subscription.rb

@@ -84,6 +84,13 @@ def customer(options = {})
         Customer.get(customer_id, options)
       end
 
+      def payments(options = {})
+        resource_url = Util.extract_url(links, 'payments')
+        return if resource_url.nil?
+        response = Mollie::Client.instance.perform_http_call('GET', resource_url, nil, {}, options)
+        Mollie::List.new(response, Payment)
+      end
+
       def metadata=(metadata)
         @metadata = OpenStruct.new(metadata) if metadata.is_a?(Hash)
       end

test/fixtures/subscriptions/get.json

@@ -0,0 +1,45 @@
+{
+    "resource": "subscription",
+    "id": "sub_8JfGzs6v3K",
+    "mode": "live",
+    "createdAt": "2016-06-01T12:23:34+00:00",
+    "status": "active",
+    "amount": {
+        "value": "25.00",
+        "currency": "EUR"
+    },
+    "times": 4,
+    "timesRemaining": 4,
+    "interval": "3 months",
+    "startDate": "2016-06-01",
+    "nextPaymentDate": "2016-09-01",
+    "description": "Quarterly payment",
+    "method": null,
+    "mandateId": "mdt_aGQNkteF6w",
+    "webhookUrl": "https://webshop.example.org/payments/webhook",
+    "metadata": {
+        "plan": "small"
+    },
+    "_links": {
+        "self": {
+            "href": "https://api.mollie.com/v2/customers/cst_8wmqcHMN4U/subscriptions/sub_8JfGzs6v3K",
+            "type": "application/hal+json"
+        },
+        "customer": {
+            "href": "https://api.mollie.com/v2/customers/cst_8wmqcHMN4U",
+            "type": "application/hal+json"
+        },
+        "payments": {
+            "href": "https://api.mollie.com/v2/customers/cst_8wmqcHMN4U/subscriptions/sub_8JfGzs6v3K/payments",
+            "type": "application/hal+json"
+        },
+        "profile": {
+            "href": "https://api.mollie.com/v2/profiles/pfl_URR55HPMGx",
+            "type": "application/hal+json"
+        },
+        "documentation": {
+            "href": "https://docs.mollie.com/reference/v2/subscriptions-api/get-subscription",
+            "type": "text/html"
+        }
+    }
+}

test/fixtures/subscriptions/get_payments.json

@@ -0,0 +1,75 @@
+{
+    "_embedded": {
+        "payments": [
+            {
+                "resource": "payment",
+                "id": "tr_DtKxVP2AgW",
+                "mode": "live",
+                "createdAt": "2018-09-19T12:49:52+00:00",
+                "amount": {
+                    "value": "10.00",
+                    "currency": "EUR"
+                },
+                "description": "Some subscription 19 sep. 2018",
+                "method": "directdebit",
+                "metadata": null,
+                "status": "pending",
+                "isCancelable": true,
+                "expiresAt": "2019-09-19T12:49:52+00:00",
+                "locale": "nl_NL",
+                "profileId": "pfl_URR55HPMGx",
+                "customerId": "cst_8wmqcHMN4U",
+                "mandateId": "mdt_aGQNkteF6w",
+                "subscriptionId": "sub_8JfGzs6v3K",
+                "sequenceType": "recurring",
+                "redirectUrl": null,
+                "webhookUrl": "https://example.org/webhook",
+                "settlementAmount": {
+                    "value": "10.00",
+                    "currency": "EUR"
+                },
+                "details": {
+                    "transferReference": "SD67-6850-2204-6029",
+                    "creditorIdentifier": "NL08ZZZ502057730000",
+                    "consumerName": "Customer A",
+                    "consumerAccount": "NL50INGB0006588912",
+                    "consumerBic": "INGBNL2A",
+                    "dueDate": "2018-09-21",
+                    "signatureDate": "2018-09-19"
+                },
+                "_links": {
+                    "self": {
+                        "href": "https://api.mollie.com/v2/payments/tr_DtKxVP2AgW",
+                        "type": "application/hal+json"
+                    },
+                    "checkout": null,
+                    "customer": {
+                        "href": "https://api.mollie.com/v2/customers/cst_8wmqcHMN4U",
+                        "type": "application/hal+json"
+                    },
+                    "mandate": {
+                        "href": "https://api.mollie.com/v2/customers/cst_8wmqcHMN4U/mandates/mdt_aGQNkteF6w",
+                        "type": "application/hal+json"
+                    },
+                    "subscription": {
+                        "href": "https://api.mollie.com/v2/customers/cst_8wmqcHMN4U/subscriptions/sub_8JfGzs6v3K",
+                        "type": "application/hal+json"
+                    }
+                }
+            }
+        ]
+    },
+    "count": 1,
+    "_links": {
+        "documentation": {
+            "href": "https://docs.mollie.com/reference/v2/subscriptions-api/list-subscriptions-payments",
+            "type": "text/html"
+        },
+        "self": {
+            "href": "https://api.mollie.com/v2/customers/cst_8wmqcHMN4U/subscriptions/sub_8JfGzs6v3K/payments?limit=50",
+            "type": "application/hal+json"
+        },
+        "previous": null,
+        "next": null
+    }
+}

test/mollie/customer/subscription_test.rb

@@ -143,6 +143,20 @@ def test_application_fee
         assert_equal 42.10, subscription.application_fee.amount.value
         assert_equal'EUR', subscription.application_fee.amount.currency
       end
+
+      def test_get_payments
+        stub_request(:get, 'https://api.mollie.com/v2/customers/cst_8wmqcHMN4U/subscriptions/sub_8JfGzs6v3K')
+          .to_return(status: 200, body: read_fixture('subscriptions/get.json'), headers: {})
+
+        stub_request(:get, 'https://api.mollie.com/v2/customers/cst_8wmqcHMN4U/subscriptions/sub_8JfGzs6v3K/payments')
+          .to_return(status: 200, body: read_fixture('subscriptions/get_payments.json'), headers: {})
+
+        subscription = Customer::Subscription.get('sub_8JfGzs6v3K', customer_id: 'cst_8wmqcHMN4U')
+        payments = subscription.payments
+
+        assert_equal payments.klass, Payment
+        assert_equal payments.first.id, 'tr_DtKxVP2AgW'
+      end
     end
   end
 end