diff --git a/README.md b/README.md
index 93ad9eb..c730821 100644
--- a/README.md
+++ b/README.md
@@ -205,6 +205,19 @@ assessment, err := client.RegisterPayment(&incognia.Payment{
 })
 ```
 
+This method registers a new **web** payment for the given installation and account, returning a `TransactionAssessment`, containing the risk assessment and supporting evidence.
+
+```go
+assessment, err := client.RegisterPayment(&incognia.Payment{
+    SessionToken:   "session-token",
+    AccountID:      "account-id",
+    ExternalID:     "external-id",
+    PolicyID:       "policy-id",
+    ...
+})
+```
+
+
 ### Registering Login
 
 This method registers a new login for the given installation and account, returning a `TransactionAssessment`, containing the risk assessment and supporting evidence.
diff --git a/incognia.go b/incognia.go
index 4bd0163..ef9e3a4 100644
--- a/incognia.go
+++ b/incognia.go
@@ -55,7 +55,8 @@ type IncogniaClientConfig struct {
 }
 
 type Payment struct {
-	InstallationID string
+	InstallationID *string
+	SessionToken   *string
 	AccountID      string
 	ExternalID     string
 	PolicyID       string
@@ -297,8 +298,8 @@ func (c *Client) registerPayment(payment *Payment) (ret *TransactionAssessment,
 		return nil, ErrMissingPayment
 	}
 
-	if payment.InstallationID == "" {
-		return nil, ErrMissingInstallationID
+	if payment.InstallationID == nil && payment.SessionToken == nil {
+		return nil, ErrMissingInstallationIDOrSessionToken
 	}
 
 	if payment.AccountID == "" {
@@ -306,7 +307,8 @@ func (c *Client) registerPayment(payment *Payment) (ret *TransactionAssessment,
 	}
 
 	requestBody, err := json.Marshal(postTransactionRequestBody{
-		InstallationID: &payment.InstallationID,
+		InstallationID: payment.InstallationID,
+		SessionToken:   payment.SessionToken,
 		Type:           paymentType,
 		AccountID:      payment.AccountID,
 		PolicyID:       payment.PolicyID,
diff --git a/incognia_test.go b/incognia_test.go
index e27660c..e9d58f8 100644
--- a/incognia_test.go
+++ b/incognia_test.go
@@ -199,13 +199,59 @@ var (
 			},
 		},
 	}
+	postPaymentWebRequestBodyFixture = &postTransactionRequestBody{
+		SessionToken: &sessionToken,
+		AccountID:    "account-id",
+		ExternalID:   "external-id",
+		PolicyID:     "policy-id",
+		Type:         paymentType,
+		Addresses: []*TransactionAddress{
+			{
+				Type: Billing,
+				StructuredAddress: &StructuredAddress{
+					Locale:       "locale",
+					CountryName:  "country-name",
+					CountryCode:  "country-code",
+					State:        "state",
+					City:         "city",
+					Borough:      "borough",
+					Neighborhood: "neighborhood",
+					Street:       "street",
+					Number:       "number",
+					Complements:  "complements",
+					PostalCode:   "postalcode",
+				},
+				AddressLine: "address line",
+				Coordinates: &Coordinates{
+					Lat: -23.561414,
+					Lng: -46.6558819,
+				},
+			},
+		},
+		PaymentValue: &PaymentValue{
+			Amount:   55.02,
+			Currency: "BRL",
+		},
+		PaymentMethods: []*PaymentMethod{
+			{
+				Type:       CreditCard,
+				Identifier: "credit-card-hash-123",
+				CreditCard: &CardInfo{
+					Bin:            "29282",
+					LastFourDigits: "2222",
+					ExpiryYear:     "2020",
+					ExpiryMonth:    "10",
+				},
+			},
+		},
+	}
 	postPaymentRequestBodyRequiredFieldsFixture = &postTransactionRequestBody{
 		InstallationID: &installationId,
 		AccountID:      "account-id",
 		Type:           paymentType,
 	}
 	paymentFixture = &Payment{
-		InstallationID: installationId,
+		InstallationID: &installationId,
 		AccountID:      "account-id",
 		ExternalID:     "external-id",
 		PolicyID:       "policy-id",
@@ -249,19 +295,64 @@ var (
 			},
 		},
 	}
+	paymentWebFixture = &Payment{
+		SessionToken: &sessionToken,
+		AccountID:    "account-id",
+		ExternalID:   "external-id",
+		PolicyID:     "policy-id",
+		Addresses: []*TransactionAddress{
+			{
+				Type: Billing,
+				StructuredAddress: &StructuredAddress{
+					Locale:       "locale",
+					CountryName:  "country-name",
+					CountryCode:  "country-code",
+					State:        "state",
+					City:         "city",
+					Borough:      "borough",
+					Neighborhood: "neighborhood",
+					Street:       "street",
+					Number:       "number",
+					Complements:  "complements",
+					PostalCode:   "postalcode",
+				},
+				AddressLine: "address line",
+				Coordinates: &Coordinates{
+					Lat: -23.561414,
+					Lng: -46.6558819,
+				},
+			},
+		},
+		Value: &PaymentValue{
+			Amount:   55.02,
+			Currency: "BRL",
+		},
+		Methods: []*PaymentMethod{
+			{
+				Type:       CreditCard,
+				Identifier: "credit-card-hash-123",
+				CreditCard: &CardInfo{
+					Bin:            "29282",
+					LastFourDigits: "2222",
+					ExpiryYear:     "2020",
+					ExpiryMonth:    "10",
+				},
+			},
+		},
+	}
 	paymentFixtureRequiredFields = &Payment{
-		InstallationID: installationId,
+		InstallationID: &installationId,
 		AccountID:      "account-id",
 	}
 	simplePaymentFixtureWithShouldEval = &Payment{
-		InstallationID: installationId,
+		InstallationID: &installationId,
 		AccountID:      "account-id",
 		ExternalID:     "external-id",
 		PolicyID:       "policy-id",
 		Eval:           &shouldEval,
 	}
 	simplePaymentFixtureWithShouldNotEval = &Payment{
-		InstallationID: installationId,
+		InstallationID: &installationId,
 		AccountID:      "account-id",
 		ExternalID:     "external-id",
 		PolicyID:       "policy-id",
@@ -617,6 +708,16 @@ func (suite *IncogniaTestSuite) TestSuccessRegisterPayment() {
 	suite.Equal(transactionAssessmentFixture, response)
 }
 
+func (suite *IncogniaTestSuite) TestSuccessRegisterPaymentWeb() {
+	transactionServer := suite.mockPostTransactionsEndpoint(token, postPaymentWebRequestBodyFixture, transactionAssessmentFixture, emptyQueryString)
+	defer transactionServer.Close()
+
+	response, err := suite.client.RegisterPayment(paymentWebFixture)
+
+	suite.NoError(err)
+	suite.Equal(transactionAssessmentFixture, response)
+}
+
 func (suite *IncogniaTestSuite) TestSuccessRegisterPaymentNilOptional() {
 	transactionServer := suite.mockPostTransactionsEndpoint(token, postPaymentRequestBodyRequiredFieldsFixture, transactionAssessmentFixture, emptyQueryString)
 	defer transactionServer.Close()
@@ -651,12 +752,12 @@ func (suite *IncogniaTestSuite) TestRegisterPaymentNilPayment() {
 
 func (suite *IncogniaTestSuite) TestRegisterPaymentEmptyInstallationId() {
 	response, err := suite.client.RegisterPayment(&Payment{AccountID: "some-account-id"})
-	suite.EqualError(err, ErrMissingInstallationID.Error())
+	suite.EqualError(err, ErrMissingInstallationIDOrSessionToken.Error())
 	suite.Nil(response)
 }
 
 func (suite *IncogniaTestSuite) TestRegisterPaymentEmptyAccountId() {
-	response, err := suite.client.RegisterPayment(&Payment{InstallationID: "some-installation-id"})
+	response, err := suite.client.RegisterPayment(&Payment{InstallationID: &installationId})
 	suite.EqualError(err, ErrMissingAccountID.Error())
 	suite.Nil(response)
 }