diff --git a/README.md b/README.md
index eb6f93e..aa1d69e 100644
--- a/README.md
+++ b/README.md
@@ -108,6 +108,7 @@ api.SearchCustomers(&cm.SearchCustomersParams{})
 api.ListCustomers(&cm.ListCustomersParams{})
 api.UpdateCustomer(&cm.NewCustomer{}, "customerUUID")
 api.MergeCustomers(&cm.MergeCustomersParams{})
+api.UnmergeCustomers(&cm.UnmergeCustomersParams{})
 api.ConnectSubscriptions("customerUUID", []cm.Subscription{})
 api.ListCustomersContact(&cm.ListContactsParams{}, "customerUUID")
 api.CreateCustomersContact(&cm.NewContact{}, "customerUUID")
@@ -319,6 +320,7 @@ To work on the library:
 * add pre-commit hook `go test ./...` (in `.git/hooks/pre-commit`) to have a working state always.
 
 ### Testing
+* Run test suite with `go test`
 * Use `net/http/httptest` for mocking HTTP server directly, see file `generic_test.go` for examples.
 * For `integration_tests` against real API use `github.com/dnaeon/go-vcr` library. Be careful to remove your API credentials from fixtures before committing! If Import API App changes, re-record the affected integration tests (by deleting fixtures).
 
diff --git a/chartmogul.go b/chartmogul.go
index 64348b3..5fe298d 100644
--- a/chartmogul.go
+++ b/chartmogul.go
@@ -91,6 +91,7 @@ type IApi interface {
 	ListCustomers(ListCustomersParams *ListCustomersParams) (*Customers, error)
 	SearchCustomers(SearchCustomersParams *SearchCustomersParams) (*Customers, error)
 	MergeCustomers(MergeCustomersParams *MergeCustomersParams) error
+	UnmergeCustomers(UnmergeCustomersParams *UnmergeCustomersParams) error
 	DeleteCustomer(customerUUID string) error
 	DeleteCustomerInvoices(dataSourceUUID, customerUUID string) error
 	DeleteCustomerInvoicesV2(dataSourceUUID, customerUUID string, DeleteCustomerInvoicesParams *DeleteCustomerInvoicesParams) error
diff --git a/customers.go b/customers.go
index 8bb4459..dd08b85 100644
--- a/customers.go
+++ b/customers.go
@@ -128,6 +128,14 @@ type MergeCustomersParams struct {
 	Into CustID `json:"into"`
 }
 
+// UnmergeCustomersParams - identify target for unmerging.
+type UnmergeCustomersParams struct {
+	CustomerUUID      string   `json:"customer_uuid"`
+	ExternalID        string   `json:"external_id"`
+	DataSourceUUID    string   `json:"data_source_uuid"`
+	MoveToNewCustomer []string `json:"move_to_new_customer,omitempty"`
+}
+
 // CustID - use either DataSourceUUID & ExternalID or CustomerUUID
 type CustID struct {
 	DataSourceUUID string `json:"data_source_uuid,omitempty"`
@@ -146,6 +154,7 @@ const (
 	customersEndpoint              = "customers"
 	searchCustomersEndpoint        = "customers/search"
 	mergeCustomersEndpoint         = "customers/merges"
+	unmergeCustomersEndpoint       = "customers/unmerges"
 	customerContactsEndpoint       = "customers/:uuid/contacts"
 )
 
@@ -211,6 +220,13 @@ func (api API) MergeCustomers(mergeCustomersParams *MergeCustomersParams) error
 	return api.merge(mergeCustomersEndpoint, *mergeCustomersParams)
 }
 
+// UnmergeCustomers unmerges two cutomers.
+//
+// See https://dev.chartmogul.com/v1.0/reference#customers
+func (api API) UnmergeCustomers(unmergeCustomersParams *UnmergeCustomersParams) error {
+	return api.unmerge(unmergeCustomersEndpoint, *unmergeCustomersParams)
+}
+
 // DeleteCustomer deletes one customer by UUID.
 //
 // See https://dev.chartmogul.com/v1.0/reference#customers
diff --git a/generic.go b/generic.go
index 55e7b2d..97dd553 100644
--- a/generic.go
+++ b/generic.go
@@ -110,6 +110,11 @@ func (api API) merge(path string, input interface{}) error {
 	return wrapErrors(res, []byte(body), errs)
 }
 
+// UPDATE
+func (api API) unmerge(path string, input interface{}) error {
+	return api.merge(path, input)
+}
+
 // updateImpl adds another meta level, because this same pattern
 // uses multiple HTTP methods in  API.
 func (api API) updateImpl(path string, uuid string, input interface{}, output interface{}, method string) error {
diff --git a/integration_tests/customers_test.go b/integration_tests/customers_test.go
index a16a487..843f7b0 100644
--- a/integration_tests/customers_test.go
+++ b/integration_tests/customers_test.go
@@ -40,6 +40,8 @@ func TestListCustomersIntegration(t *testing.T) {
 
 	validateListCustomers(api, ds.UUID, t)
 	validateSearchCustomers(api, "abc@123.com", t)
+	validateMergeCustomers(api, t)
+	validateUnmergeCustomers(api, t)
 	validateCustomerRetrievalAndUpdate(api, customers[1], t)
 }
 
@@ -113,6 +115,30 @@ func validateSearchCustomers(api *cm.API, email string, t *testing.T) {
 	}
 }
 
+// validateMergeCustomers validates that the specified customers can be correctly merged using the API.
+func validateMergeCustomers(api *cm.API, t *testing.T) {
+	err := api.MergeCustomers(&cm.MergeCustomersParams{
+		From: cm.CustID{CustomerUUID: "cus_2706d304-76b7-11ee-93d6-5b3d820d37cd"},
+		Into: cm.CustID{CustomerUUID: "cus_23740208-2c7e-11ee-9ea2-ffd2435982bb"},
+	})
+	if err != nil {
+		t.Fatalf("Failed to merge customers: %v", err)
+	}
+}
+
+// validateUnmergeCustomers validates that the specified customers can be correctly unmerged using the API.
+func validateUnmergeCustomers(api *cm.API, t *testing.T) {
+	err := api.UnmergeCustomers(&cm.UnmergeCustomersParams{
+		CustomerUUID:      "cus_cd9e5f29-6299-40e5-b343-0bd1ed228b4f",
+		ExternalID:        "cus_O075O8NH0LrtG8",
+		DataSourceUUID:    "ds_788ec6ae-dd51-11ee-bd46-a3ec952dc041",
+		MoveToNewCustomer: []string{"tasks"},
+	})
+	if err != nil {
+		t.Fatalf("Failed to unmerge customers: %v", err)
+	}
+}
+
 // validatecustomerRetrievalAndUpdate checks that a given customer can be retrieved and updated
 // correctly through the API.
 func validateCustomerRetrievalAndUpdate(api *cm.API, customerToUpdate *cm.Customer, t *testing.T) {