diff --git a/src/main/java/it/gov/pagopa/wispconverter/controller/ReceiptTimerController.java b/src/main/java/it/gov/pagopa/wispconverter/controller/ReceiptTimerController.java
index 5f91a088..4d55750e 100644
--- a/src/main/java/it/gov/pagopa/wispconverter/controller/ReceiptTimerController.java
+++ b/src/main/java/it/gov/pagopa/wispconverter/controller/ReceiptTimerController.java
@@ -10,6 +10,7 @@
 import it.gov.pagopa.wispconverter.controller.model.ReceiptTimerRequest;
 import it.gov.pagopa.wispconverter.service.ReceiptTimerService;
 import it.gov.pagopa.wispconverter.util.Trace;
+import java.util.Arrays;
 import java.util.List;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
@@ -53,9 +54,9 @@ public void createTimer(@RequestBody ReceiptTimerRequest request) {
             produces = MediaType.APPLICATION_JSON_VALUE
     )
     @Trace(businessProcess = BP_TIMER_DELETE, reEnabled = true)
-    public void deleteTimer(@RequestParam List<String> paymentTokens) {
-        log.info("Delete Timer arrived: " + paymentTokens);
-        receiptTimerService.cancelScheduledMessage(paymentTokens);
-
+  public void deleteTimer(@RequestParam() String paymentTokens) {
+        List<String> tokens = Arrays.asList(paymentTokens.split(","));
+        log.info("Delete Timer arrived: " + tokens);
+        receiptTimerService.cancelScheduledMessage(tokens);
     }
 }
diff --git a/src/test/java/it/gov/pagopa/wispconverter/endpoint/ReceiptTimerTest.java b/src/test/java/it/gov/pagopa/wispconverter/endpoint/ReceiptTimerTest.java
index 545d4b42..b7532b1a 100644
--- a/src/test/java/it/gov/pagopa/wispconverter/endpoint/ReceiptTimerTest.java
+++ b/src/test/java/it/gov/pagopa/wispconverter/endpoint/ReceiptTimerTest.java
@@ -120,7 +120,7 @@ public void testDeleteTimer() throws Exception {
         List<String> paymentTokens = List.of("token1", "token2");
 
         mockMvc.perform(delete("/receipt/timer")
-                        .param("paymentTokens", "token1", "token2")
+                        .param("paymentTokens", "token1,token2")
                         .contentType(MediaType.APPLICATION_JSON))
                 .andExpect(status().isOk());
 
@@ -135,7 +135,7 @@ public void testDeleteTimerServiceException() throws Exception {
         doThrow(new RuntimeException("Service exception")).when(receiptTimerService).cancelScheduledMessage(Mockito.eq(paymentTokens));
 
         mockMvc.perform(delete("/receipt/timer")
-                        .param("paymentTokens", "token1", "token2")
+                        .param("paymentTokens", "token1,token2")
                         .contentType(MediaType.APPLICATION_JSON))
                 .andExpect(status().isInternalServerError());