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diff --git a/taler-kotlin-android/src/main/java/net/taler/lib/common/TimestampMixin.kt b/taler-kotlin-android/src/main/java/net/taler/lib/common/TimestampMixin.kt
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+++ b/taler-kotlin-android/src/main/java/net/taler/lib/common/TimestampMixin.kt
@@ -0,0 +1,39 @@
+/*
+ * This file is part of GNU Taler
+ * (C) 2020 Taler Systems S.A.
+ *
+ * GNU Taler is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 3, or (at your option) any later version.
+ *
+ * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
+ */
+
+package net.taler.lib.common
+
+import com.fasterxml.jackson.annotation.JsonProperty
+import com.fasterxml.jackson.core.JsonParser
+import com.fasterxml.jackson.databind.DeserializationContext
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize
+import com.fasterxml.jackson.databind.deser.std.StdDeserializer
+
+/**
+ * Used to support Jackson serialization along with KotlinX.
+ */
+abstract class TimestampMixin(
+ @get:JsonDeserialize(using = NeverDeserializer::class)
+ @get:JsonProperty("t_ms")
+ val ms: Long
+)
+
+class NeverDeserializer : StdDeserializer<Long>(Long::class.java) {
+ override fun deserialize(p: JsonParser, ctxt: DeserializationContext): Long {
+ return if (p.text == "never") -1
+ else p.longValue
+ }
+}