diff --git a/src/main/java/com/simprints/libsimprints/Identification.kt b/src/main/java/com/simprints/libsimprints/Identification.kt
index dc81528..57df0ea 100644
--- a/src/main/java/com/simprints/libsimprints/Identification.kt
+++ b/src/main/java/com/simprints/libsimprints/Identification.kt
@@ -4,13 +4,6 @@ import android.os.Parcel
 import android.os.Parcelable
 import android.os.Parcelable.Creator
 
-/**
- * This constructor creates a new identification
- *
- * @param guid       Global unique id of the verified person
- * @param confidence An int containing the (matching) confidence
- * @param tier       The tier score derived from the confidence
- */
 @Deprecated("Use contracts.data.Identification instead")
 data class Identification(
     val guid: String,
diff --git a/src/main/java/com/simprints/libsimprints/contracts/data/Enrolment.kt b/src/main/java/com/simprints/libsimprints/contracts/data/Enrolment.kt
index 8f72fc7..75dffde 100644
--- a/src/main/java/com/simprints/libsimprints/contracts/data/Enrolment.kt
+++ b/src/main/java/com/simprints/libsimprints/contracts/data/Enrolment.kt
@@ -1,5 +1,10 @@
 package com.simprints.libsimprints.contracts.data
 
+/**
+ * This constructor creates a new enrolment result
+ *
+ * @param guid Global unique id of the new enrolment
+ */
 data class Enrolment(
     val guid: String,
 ) {
diff --git a/src/main/java/com/simprints/libsimprints/contracts/data/Identification.kt b/src/main/java/com/simprints/libsimprints/contracts/data/Identification.kt
index 2eca397..b826f06 100644
--- a/src/main/java/com/simprints/libsimprints/contracts/data/Identification.kt
+++ b/src/main/java/com/simprints/libsimprints/contracts/data/Identification.kt
@@ -3,7 +3,7 @@ package com.simprints.libsimprints.contracts.data
 import org.json.JSONArray
 
 /**
- * This constructor creates a new identification
+ * This constructor creates a new identification result
  *
  * @param guid           Global unique id of the verified person
  * @param confidence     An int containing the (matching) confidence
diff --git a/src/main/java/com/simprints/libsimprints/contracts/data/JsonExt.kt b/src/main/java/com/simprints/libsimprints/contracts/data/JsonExt.kt
index 8a00510..8ed7fc4 100644
--- a/src/main/java/com/simprints/libsimprints/contracts/data/JsonExt.kt
+++ b/src/main/java/com/simprints/libsimprints/contracts/data/JsonExt.kt
@@ -4,7 +4,7 @@ import org.json.JSONArray
 import org.json.JSONException
 import org.json.JSONObject
 
-internal inline fun <T> T.asJsonObject(crossinline block: (JSONObject) -> JSONObject): JSONObject = JSONObject().also { block(it) }
+internal inline fun <T> T.asJsonObject(crossinline block: (JSONObject) -> Unit): JSONObject = JSONObject().also { block(it) }
 
 internal inline fun <T> fromJsonString(
     jsonString: String,
diff --git a/src/main/java/com/simprints/libsimprints/contracts/data/RefusalForm.kt b/src/main/java/com/simprints/libsimprints/contracts/data/RefusalForm.kt
index da02ee3..6a4e9eb 100644
--- a/src/main/java/com/simprints/libsimprints/contracts/data/RefusalForm.kt
+++ b/src/main/java/com/simprints/libsimprints/contracts/data/RefusalForm.kt
@@ -1,5 +1,11 @@
 package com.simprints.libsimprints.contracts.data
 
+/**
+ * This constructor creates a new refusal form response
+ *
+ * @param reason Refusal reason chosen by user out of the provided options
+ * @param extra  Additional information provided by the user
+ */
 data class RefusalForm(
     val reason: String,
     val extra: String,
diff --git a/src/main/java/com/simprints/libsimprints/contracts/data/Verification.kt b/src/main/java/com/simprints/libsimprints/contracts/data/Verification.kt
index 30016bf..f49681c 100644
--- a/src/main/java/com/simprints/libsimprints/contracts/data/Verification.kt
+++ b/src/main/java/com/simprints/libsimprints/contracts/data/Verification.kt
@@ -3,21 +3,24 @@ package com.simprints.libsimprints.contracts.data
 /**
  * This constructor creates a new identification
  *
- * @param guid       Global unique id of the verified person
- * @param confidence An int containing the (matching) confidence
+ * @param guid           Global unique id of the verified person
+ * @param confidence     An int containing the (matching) confidence
  * @param confidenceBand Confidence qualifier based on the project's configuration
+ * @param isSuccess      Whether the confidence is higher than threshold in the project's configuration if configured
  */
 data class Verification(
     val guid: String,
     val confidence: Float,
     val confidenceBand: ConfidenceBand,
-    val isSuccess: Boolean,
+    val isSuccess: Boolean?,
 ) {
     fun toJson(): String = asJsonObject {
         it.put(KEY_GUID, guid)
         it.put(KEY_CONFIDENCE_BAND, confidenceBand.name)
         it.put(KEY_CONFIDENCE, confidence)
-        it.put(KEY_IS_SUCCESS, isSuccess)
+        if (isSuccess != null) {
+            it.put(KEY_IS_SUCCESS, isSuccess)
+        }
     }.toString()
 
     companion object {
@@ -30,7 +33,13 @@ data class Verification(
             val guid = json.getString(KEY_GUID)
             val confidence = json.getDouble(KEY_CONFIDENCE).toFloat()
             val band = json.getString(KEY_CONFIDENCE_BAND).let { ConfidenceBand.valueOf(it) }
-            val isSuccess = json.getBoolean(KEY_IS_SUCCESS)
+
+            // Success flag is only provided if threshold is enabled in project configuration
+            val isSuccess = if (!json.isNull(KEY_IS_SUCCESS)) {
+                json.getBoolean(KEY_IS_SUCCESS)
+            } else {
+                null
+            }
 
             Verification(guid, confidence, band, isSuccess)
         }
diff --git a/src/test/java/com/simprints/libsimprints/contracts/data/VerificationTest.kt b/src/test/java/com/simprints/libsimprints/contracts/data/VerificationTest.kt
index 016a0ff..2ca747e 100644
--- a/src/test/java/com/simprints/libsimprints/contracts/data/VerificationTest.kt
+++ b/src/test/java/com/simprints/libsimprints/contracts/data/VerificationTest.kt
@@ -14,4 +14,12 @@ class VerificationTest {
 
         Assert.assertEquals(expected, actual)
     }
+
+    @Test
+    fun `test verification does not have isSuccess if null`() {
+        val expected = Verification("case-id", 42f, ConfidenceBand.HIGH, null)
+        val actual = Verification.fromJson(expected.toJson())
+
+        Assert.assertEquals(expected, actual)
+    }
 }