diff --git a/Sources/ProcessOut/Sources/Repositories/CustomerTokens/HttpCustomerTokensRepository.swift b/Sources/ProcessOut/Sources/Repositories/CustomerTokens/HttpCustomerTokensRepository.swift
index 282b41d83..050d05ccf 100644
--- a/Sources/ProcessOut/Sources/Repositories/CustomerTokens/HttpCustomerTokensRepository.swift
+++ b/Sources/ProcessOut/Sources/Repositories/CustomerTokens/HttpCustomerTokensRepository.swift
@@ -39,6 +39,7 @@ final class HttpCustomerTokensRepository: CustomerTokensRepository {
         }
         let httpRequest = HttpConnectorRequest<Response>.post(
             path: "/customers/\(request.customerId)/tokens",
+            body: request,
             includesDeviceMetadata: true,
             requiresPrivateKey: true
         )
diff --git a/Sources/ProcessOut/Sources/Repositories/CustomerTokens/Requests/POCreateCustomerTokenRequest.swift b/Sources/ProcessOut/Sources/Repositories/CustomerTokens/Requests/POCreateCustomerTokenRequest.swift
index fefade7b6..49335b94c 100644
--- a/Sources/ProcessOut/Sources/Repositories/CustomerTokens/Requests/POCreateCustomerTokenRequest.swift
+++ b/Sources/ProcessOut/Sources/Repositories/CustomerTokens/Requests/POCreateCustomerTokenRequest.swift
@@ -8,16 +8,17 @@
 import Foundation
 
 @_spi(PO)
-public struct POCreateCustomerTokenRequest {
+public struct POCreateCustomerTokenRequest: Encodable {
 
     /// Customer id to associate created token with.
-    public let customerId: String
+    @POImmutableExcludedCodable
+    public var customerId: String
 
     /// Flag if you wish to verify the customer token by making zero value transaction. Applicable for cards only.
     public let verify: Bool
 
     public init(customerId: String, verify: Bool = false) {
-        self.customerId = customerId
+        self._customerId = .init(value: customerId)
         self.verify = verify
     }
 }
diff --git a/Tests/ProcessOutTests/Sources/Integration/CustomerTokensServiceTests.swift b/Tests/ProcessOutTests/Sources/Integration/CustomerTokensServiceTests.swift
index 8ed4c5247..23cfbee4d 100644
--- a/Tests/ProcessOutTests/Sources/Integration/CustomerTokensServiceTests.swift
+++ b/Tests/ProcessOutTests/Sources/Integration/CustomerTokensServiceTests.swift
@@ -38,11 +38,10 @@ import XCTest
         let card = try await cardsService.tokenize(
             request: .init(number: "4242424242424242", expMonth: 12, expYear: 40, cvc: "737")
         )
-        let token = try await sut.createCustomerToken(
-            request: POCreateCustomerTokenRequest(customerId: Constants.customerId)
-        )
         let request = POAssignCustomerTokenRequest(
-            customerId: Constants.customerId, tokenId: token.id, source: card.id, verify: false
+            customerId: Constants.customerId,
+            tokenId: try await createToken(verify: false).id,
+            source: card.id
         )
 
         // When
@@ -52,8 +51,39 @@ import XCTest
         XCTAssertEqual(updatedToken.cardId, card.id)
     }
 
+    func test_assignCustomerToken_whenVerifyIsSetToTrue_triggers3DS() async throws {
+        // Given
+        let card = try await cardsService.tokenize(
+            request: .init(number: "4000000000000101", expMonth: 12, expYear: 40, cvc: "737")
+        )
+        let request = POAssignCustomerTokenRequest(
+            customerId: Constants.customerId,
+            tokenId: try await createToken(verify: true).id,
+            source: card.id,
+            verify: true,
+            enableThreeDS2: true
+        )
+        let threeDSService = Mock3DSService()
+        threeDSService.authenticationRequestFromClosure = { _, completion in
+            completion(.failure(.init(code: .cancelled)))
+        }
+
+        // When
+        _ = try? await sut.assignCustomerToken(request: request, threeDSService: threeDSService)
+
+        // Then
+        XCTAssertEqual(threeDSService.authenticationRequestCallsCount, 1)
+    }
+
     // MARK: - Private Properties
 
     private var sut: POCustomerTokensService!
     private var cardsService: POCardsService!
+
+    // MARK: - Private Methods
+
+    private func createToken(verify: Bool) async throws -> POCustomerToken {
+        let request = POCreateCustomerTokenRequest(customerId: Constants.customerId, verify: verify)
+        return try await sut.createCustomerToken(request: request)
+    }
 }
diff --git a/Tests/ProcessOutTests/Sources/Mocks/3DS/Mock3DSService.swift b/Tests/ProcessOutTests/Sources/Mocks/3DS/Mock3DSService.swift
index 084ae779a..7c0d28854 100644
--- a/Tests/ProcessOutTests/Sources/Mocks/3DS/Mock3DSService.swift
+++ b/Tests/ProcessOutTests/Sources/Mocks/3DS/Mock3DSService.swift
@@ -26,17 +26,17 @@ final class Mock3DSService: PO3DSService {
         completion: @escaping (Result<PO3DS2AuthenticationRequest, POFailure>) -> Void
     ) {
         authenticationRequestCallsCount += 1
-        authenticationRequestFromClosure(configuration, completion)
+        authenticationRequestFromClosure?(configuration, completion)
     }
 
     func handle(challenge: PO3DS2Challenge, completion: @escaping (Result<Bool, POFailure>) -> Void) {
         handleChallengeCallsCount += 1
-        handleChallengeFromClosure(challenge, completion)
+        handleChallengeFromClosure?(challenge, completion)
     }
 
     func handle(redirect: PO3DSRedirect, completion: @escaping (Result<String, POFailure>) -> Void) {
         handleRedirectCallsCount += 1
-        handleRedirectFromClosure(redirect, completion)
+        handleRedirectFromClosure?(redirect, completion)
     }
 }