feat (invoice-payment-url): add support for invoice payment url

lib/lago/api/resources/invoice.rb

@@ -49,6 +49,13 @@ def retry_payment(invoice_id)
           JSON.parse(response.to_json, object_class: OpenStruct)
         end
 
+        def payment_url(invoice_id)
+          path = "/api/v1/invoices/#{invoice_id}/payment_url"
+          response = connection.post({}, path)['invoice_payment_details']
+
+          JSON.parse(response.to_json, object_class: OpenStruct)
+        end
+
         def whitelist_params(params)
           result = {
             payment_status: params[:payment_status],

spec/lago/api/resources/invoice_spec.rb

@@ -261,4 +261,26 @@
       expect(result).to eq(true)
     end
   end
+
+  describe '#payment_url' do
+    let(:url_response) do
+      {
+        'invoice_payment_details' => {
+          'payment_url' => 'https://example.com',
+        }
+      }.to_json
+    end
+
+    before do
+      stub_request(:post, "https://api.getlago.com/api/v1/invoices/#{invoice_id}/payment_url")
+        .with(body: {})
+        .to_return(body: url_response, status: 200)
+    end
+
+    it 'returns payment url' do
+      result = resource.payment_url(invoice_id)
+
+      expect(result.payment_url).to eq('https://example.com')
+    end
+  end
 end