Add technical cancel API request

modification.go

@@ -87,3 +87,22 @@ type AdjustAuthorisationResponse struct {
 	PspReference string `json:"pspReference"`
 	Response     string `json:"response"`
 }
+
+/******************
+* Techical Cancel *
+******************/
+
+// TechnicalCancel structure for performing technical cancellation
+//
+// Link - https://docs.adyen.com/developers/payment-modifications#technicalcancel
+type TechnicalCancel struct {
+	MerchantAccount           string `json:"merchantAccount"`
+	OriginalMerchantReference string `json:"originalMerchantReference"`
+	Reference                 string `json:"reference,omitempty"`
+}
+
+// TechnicalCancelResponse is a response for TechnicalCancel request
+type TechnicalCancelResponse struct {
+	PspReference string `json:"pspReference"`
+	Response     string `json:"response"`
+}

modification_gateway.go

@@ -7,6 +7,7 @@ const (
 	cancelOrRefundType  = "cancelOrRefund"
 	refundType          = "refund"
 	adjustAuthorisation = "adjustAuthorisation"
+	technicalCancel     = "technicalCancel"
 )
 
 // ModificationGateway - Adyen modification transaction logic, capture, cancel, refunds and e.t.c
@@ -81,3 +82,18 @@ func (a *ModificationGateway) AdjustAuthorisation(req *AdjustAuthorisation) (*Ad
 
 	return resp.adjustAuthorisation()
 }
+
+// TechnicalCancel - perform cancellation without knowing orinal payment reference (PSP), f.e. in case of technical error
+//
+// Link - https://docs.adyen.com/developers/payment-modifications#technicalcancel
+func (a *ModificationGateway) TechnicalCancel(req *TechnicalCancel) (*TechnicalCancelResponse, error) {
+	url := a.adyenURL(PaymentService, technicalCancel, PaymentAPIVersion)
+
+	resp, err := a.execute(url, req)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return resp.technicalCancel()
+}

response.go

@@ -99,6 +99,16 @@ func (r *Response) adjustAuthorisation() (*AdjustAuthorisationResponse, error) {
 	return &a, nil
 }
 
+// technicalCancel - generate Adyen Technical Cancel API Response
+func (r *Response) technicalCancel() (*TechnicalCancelResponse, error) {
+	var a TechnicalCancelResponse
+	if err := json.Unmarshal(r.Body, &a); err != nil {
+		return nil, err
+	}
+
+	return &a, nil
+}
+
 // directoryLookup - generate Adyen Directory Lookup response
 func (r *Response) directoryLookup() (*DirectoryLookupResponse, error) {
 	var a DirectoryLookupResponse

response_test.go

@@ -476,3 +476,53 @@ func TestAdjustAuthorisationResponse(t *testing.T) {
 		})
 	}
 }
+
+func TestTechnicalCancelResponse(t *testing.T) {
+	cases := []struct {
+		name      string
+		input     string
+		reference string
+		response  string
+		expErr    bool
+	}{
+		{
+			name: "technicalCancel response",
+			input: `{
+				"pspReference" : "8413547924770610",
+				"response" : "[technical-cancel-received]"
+			}`,
+			reference: "8413547924770610",
+			response:  "[technical-cancel-received]",
+		},
+		{
+			name:      "technicalCancel returns errors",
+			input:     "some error string",
+			reference: "",
+			response:  "",
+			expErr:    true,
+		},
+	}
+
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			response, err := createTestResponse(c.input, "OK 200", 200)
+
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			res, err := response.technicalCancel()
+
+			if c.expErr {
+				if err == nil {
+					t.Fatal("expected error but didn't get one")
+				}
+
+				return
+			}
+
+			equals(t, c.reference, res.PspReference)
+			equals(t, c.response, res.Response)
+		})
+	}
+}