diff --git a/application/aam-backend-service/src/main/kotlin/com/aamdigital/aambackendservice/notification/core/DefaultTriggerWebhookUseCase.kt b/application/aam-backend-service/src/main/kotlin/com/aamdigital/aambackendservice/notification/core/DefaultTriggerWebhookUseCase.kt
index 3f0317c..69e6204 100644
--- a/application/aam-backend-service/src/main/kotlin/com/aamdigital/aambackendservice/notification/core/DefaultTriggerWebhookUseCase.kt
+++ b/application/aam-backend-service/src/main/kotlin/com/aamdigital/aambackendservice/notification/core/DefaultTriggerWebhookUseCase.kt
@@ -1,12 +1,12 @@
 package com.aamdigital.aambackendservice.notification.core
 
-import com.aamdigital.aambackendservice.couchdb.core.getEmptyQueryParams
 import com.aamdigital.aambackendservice.domain.DomainReference
 import com.aamdigital.aambackendservice.notification.core.event.NotificationEvent
 import org.slf4j.LoggerFactory
 import org.springframework.http.HttpHeaders
 import org.springframework.http.HttpMethod
 import org.springframework.http.MediaType
+import org.springframework.web.reactive.function.BodyInserters
 import org.springframework.web.reactive.function.client.WebClient
 import reactor.core.publisher.Mono
 import java.net.URI
@@ -23,9 +23,6 @@ class DefaultTriggerWebhookUseCase(
             webhookRef = DomainReference(notificationEvent.webhookId)
         )
             .flatMap { webhook ->
-                val queryParams = getEmptyQueryParams()
-                queryParams.set("calculation_id", notificationEvent.calculationId)
-
                 val uri = URI(
                     uriParser.replacePlaceholder(
                         webhook.target.url,
@@ -41,12 +38,18 @@ class DefaultTriggerWebhookUseCase(
                         it.scheme(uri.scheme)
                         it.host(uri.host)
                         it.path(uri.path)
-                        it.queryParams(queryParams)
                         it.build()
                     }
                     .headers {
                         it.set(HttpHeaders.AUTHORIZATION, "Token ${webhook.authentication.secret}")
                     }
+                    .body(
+                        BodyInserters.fromValue(
+                            mapOf(
+                                Pair("calculation_id", notificationEvent.calculationId)
+                            )
+                        )
+                    )
                     .accept(MediaType.APPLICATION_JSON)
                     .exchangeToMono { response ->
                         response.bodyToMono(String::class.java)