diff --git a/README.md b/README.md
index 13568f7..e325cc7 100644
--- a/README.md
+++ b/README.md
@@ -148,6 +148,7 @@ assessment, err := client.RegisterPayment(&incognia.Payment{
     AccountID:      "account-id",
     ExternalID:     "external-id",
     PolicyID:       "policy-id",
+    CustomProperties: myCustomPropertiesMap
     Addresses: []*incognia.TransactionAddress{
         {
             Type: incognia.Billing,
@@ -216,6 +217,7 @@ assessment, err := client.RegisterLogin(&incognia.Login{
     ExternalID:                 "external-id",
     PolicyID:                   "policy-id",
     PaymentMethodIdentifier:    "payment-method-identifier",
+    CustomProperties: myCustomPropertiesMap,
 })
 ```
 
diff --git a/incognia.go b/incognia.go
index a435b57..36b8064 100644
--- a/incognia.go
+++ b/incognia.go
@@ -45,16 +45,17 @@ type IncogniaClientConfig struct {
 }
 
 type Payment struct {
-	InstallationID *string
-	SessionToken   *string
-	RequestToken   string
-	AccountID      string
-	ExternalID     string
-	PolicyID       string
-	Addresses      []*TransactionAddress
-	Value          *PaymentValue
-	Methods        []*PaymentMethod
-	Eval           *bool
+	InstallationID   *string
+	SessionToken     *string
+	RequestToken     string
+	AccountID        string
+	ExternalID       string
+	PolicyID         string
+	Addresses        []*TransactionAddress
+	Value            *PaymentValue
+	Methods          []*PaymentMethod
+	Eval             *bool
+	CustomProperties map[string]interface{}
 }
 
 type Login struct {
@@ -66,6 +67,7 @@ type Login struct {
 	PolicyID                string
 	PaymentMethodIdentifier string
 	Eval                    *bool
+	CustomProperties        map[string]interface{}
 }
 
 type FeedbackIdentifiers struct {
@@ -282,16 +284,17 @@ func (c *Client) registerPayment(payment *Payment) (ret *TransactionAssessment,
 	}
 
 	requestBody, err := json.Marshal(postTransactionRequestBody{
-		InstallationID: payment.InstallationID,
-		RequestToken:   payment.RequestToken,
-		SessionToken:   payment.SessionToken,
-		Type:           paymentType,
-		AccountID:      payment.AccountID,
-		PolicyID:       payment.PolicyID,
-		ExternalID:     payment.ExternalID,
-		Addresses:      payment.Addresses,
-		PaymentValue:   payment.Value,
-		PaymentMethods: payment.Methods,
+		InstallationID:   payment.InstallationID,
+		RequestToken:     payment.RequestToken,
+		SessionToken:     payment.SessionToken,
+		Type:             paymentType,
+		AccountID:        payment.AccountID,
+		PolicyID:         payment.PolicyID,
+		ExternalID:       payment.ExternalID,
+		Addresses:        payment.Addresses,
+		PaymentValue:     payment.Value,
+		PaymentMethods:   payment.Methods,
+		CustomProperties: payment.CustomProperties,
 	})
 	if err != nil {
 		return nil, err
@@ -351,6 +354,7 @@ func (c *Client) registerLogin(login *Login) (*TransactionAssessment, error) {
 		PaymentMethodIdentifier: login.PaymentMethodIdentifier,
 		SessionToken:            login.SessionToken,
 		RequestToken:            login.RequestToken,
+		CustomProperties:        login.CustomProperties,
 	})
 	if err != nil {
 		return nil, err
diff --git a/incognia_test.go b/incognia_test.go
index 88c67bb..c2c8197 100644
--- a/incognia_test.go
+++ b/incognia_test.go
@@ -21,10 +21,14 @@ const (
 )
 
 var (
-	now                                          = time.Now()
-	nowMinusSeconds                              = now.Add(-1 * time.Second)
-	installationId                               = "installation-id"
-	requestToken                                 = "request-token"
+	now             = time.Now()
+	nowMinusSeconds = now.Add(-1 * time.Second)
+	installationId  = "installation-id"
+	requestToken    = "request-token"
+	customProperty  = map[string]interface{}{
+		"custom_1": "custom_value_1",
+		"custom_2": "custom_value_2",
+	}
 	shouldEval               bool                = true
 	shouldNotEval            bool                = false
 	emptyQueryString         map[string][]string = nil
@@ -174,11 +178,12 @@ var (
 		},
 	}
 	postPaymentRequestBodyFixture = &postTransactionRequestBody{
-		InstallationID: &installationId,
-		AccountID:      "account-id",
-		ExternalID:     "external-id",
-		PolicyID:       "policy-id",
-		Type:           paymentType,
+		InstallationID:   &installationId,
+		AccountID:        "account-id",
+		ExternalID:       "external-id",
+		PolicyID:         "policy-id",
+		Type:             paymentType,
+		CustomProperties: customProperty,
 		Addresses: []*TransactionAddress{
 			{
 				Type: Billing,
@@ -271,10 +276,11 @@ var (
 		Type:           paymentType,
 	}
 	paymentFixture = &Payment{
-		InstallationID: &installationId,
-		AccountID:      "account-id",
-		ExternalID:     "external-id",
-		PolicyID:       "policy-id",
+		InstallationID:   &installationId,
+		AccountID:        "account-id",
+		ExternalID:       "external-id",
+		PolicyID:         "policy-id",
+		CustomProperties: customProperty,
 		Addresses: []*TransactionAddress{
 			{
 				Type: Billing,
@@ -390,6 +396,7 @@ var (
 		AccountID:               "account-id",
 		ExternalID:              "external-id",
 		PolicyID:                "policy-id",
+		CustomProperties:        customProperty,
 		PaymentMethodIdentifier: "payment-method-identifier",
 	}
 	loginFixtureWithShouldEval = &Login{
@@ -399,6 +406,7 @@ var (
 		PolicyID:                "policy-id",
 		PaymentMethodIdentifier: "payment-method-identifier",
 		Eval:                    &shouldEval,
+		CustomProperties:        customProperty,
 	}
 	loginFixtureWithShouldNotEval = &Login{
 		InstallationID: &installationId,
@@ -421,6 +429,7 @@ var (
 		PolicyID:                "policy-id",
 		PaymentMethodIdentifier: "payment-method-identifier",
 		Type:                    loginType,
+		CustomProperties:        customProperty,
 	}
 	postLoginWebRequestBodyFixture = &postTransactionRequestBody{
 		AccountID:               "account-id",
diff --git a/request_types.go b/request_types.go
index 1d32a44..84eb31a 100644
--- a/request_types.go
+++ b/request_types.go
@@ -22,15 +22,16 @@ type StructuredAddress struct {
 }
 
 type postAssessmentRequestBody struct {
-	InstallationID    string             `json:"installation_id,omitempty"`
-	RequestToken      string             `json:"request_token,omitempty"`
-	SessionToken      string             `json:"session_token,omitempty"`
-	AddressLine       string             `json:"address_line,omitempty"`
-	StructuredAddress *StructuredAddress `json:"structured_address,omitempty"`
-	Coordinates       *Coordinates       `json:"address_coordinates,omitempty"`
-	AccountID         string             `json:"account_id,omitempty"`
-	PolicyID          string             `json:"policy_id,omitempty"`
-	ExternalID        string             `json:"external_id,omitempty"`
+	InstallationID    string                 `json:"installation_id,omitempty"`
+	RequestToken      string                 `json:"request_token,omitempty"`
+	SessionToken      string                 `json:"session_token,omitempty"`
+	AddressLine       string                 `json:"address_line,omitempty"`
+	StructuredAddress *StructuredAddress     `json:"structured_address,omitempty"`
+	Coordinates       *Coordinates           `json:"address_coordinates,omitempty"`
+	AccountID         string                 `json:"account_id,omitempty"`
+	PolicyID          string                 `json:"policy_id,omitempty"`
+	ExternalID        string                 `json:"external_id,omitempty"`
+	CustomProperties  map[string]interface{} `json:"custom_properties,omitempty"`
 }
 
 type FeedbackType string
@@ -133,15 +134,16 @@ type PaymentMethod struct {
 }
 
 type postTransactionRequestBody struct {
-	ExternalID              string                `json:"external_id,omitempty"`
-	PolicyID                string                `json:"policy_id,omitempty"`
-	InstallationID          *string               `json:"installation_id,omitempty"`
-	PaymentMethodIdentifier string                `json:"payment_method_identifier,omitempty"`
-	Type                    transactionType       `json:"type"`
-	AccountID               string                `json:"account_id"`
-	Addresses               []*TransactionAddress `json:"addresses,omitempty"`
-	PaymentValue            *PaymentValue         `json:"payment_value,omitempty"`
-	PaymentMethods          []*PaymentMethod      `json:"payment_methods,omitempty"`
-	SessionToken            *string               `json:"session_token,omitempty"`
-	RequestToken            string                `json:"request_token,omitempty"`
+	ExternalID              string                 `json:"external_id,omitempty"`
+	PolicyID                string                 `json:"policy_id,omitempty"`
+	InstallationID          *string                `json:"installation_id,omitempty"`
+	PaymentMethodIdentifier string                 `json:"payment_method_identifier,omitempty"`
+	Type                    transactionType        `json:"type"`
+	AccountID               string                 `json:"account_id"`
+	Addresses               []*TransactionAddress  `json:"addresses,omitempty"`
+	PaymentValue            *PaymentValue          `json:"payment_value,omitempty"`
+	PaymentMethods          []*PaymentMethod       `json:"payment_methods,omitempty"`
+	SessionToken            *string                `json:"session_token,omitempty"`
+	RequestToken            string                 `json:"request_token,omitempty"`
+	CustomProperties        map[string]interface{} `json:"custom_properties,omitempty"`
 }