diff --git a/backend/src/apis/gms/GmsClient.ts b/backend/src/apis/gms/GmsClient.ts
index 44980fec2..8d4876ead 100644
--- a/backend/src/apis/gms/GmsClient.ts
+++ b/backend/src/apis/gms/GmsClient.ts
@@ -151,7 +151,7 @@ export async function verifyAuthToken(
   token: string,
 ): Promise<string> {
   const baseUrl = CONFIG.GMS_URL.endsWith('/') ? CONFIG.GMS_URL : CONFIG.GMS_URL.concat('/')
-  const service = 'verify-auth-token'
+  const service = 'verify-auth-token?token='.concat(token).concat('&uuid=').concat(communityUuid)
   const config = {
     headers: {
       accept: 'application/json',
@@ -161,12 +161,14 @@ export async function verifyAuthToken(
       // authorization: apiKey,
     },
   }
+  /*
   const data = {
     uuid: communityUuid,
     token: token,
   }
+  */
   try {
-    const result = await axios.get(baseUrl.concat(service), data, config)
+    const result = await axios.get(baseUrl.concat(service), config)
     logger.debug('GET-Response of verify-auth-token:', result)
     if (result.status !== 200) {
       throw new LogError(
diff --git a/backend/src/server/createServer.ts b/backend/src/server/createServer.ts
index 01c106737..a901d8763 100644
--- a/backend/src/server/createServer.ts
+++ b/backend/src/server/createServer.ts
@@ -97,7 +97,7 @@ export const createServer = async (
 
   // GMS Webhook
   // eslint-disable-next-line @typescript-eslint/no-misused-promises
-  app.post('/hook/gms/' + CONFIG.GMS_WEBHOOK_SECRET, gmsWebhook)
+  app.get('/hook/gms/' + CONFIG.GMS_WEBHOOK_SECRET, gmsWebhook)
 
   // Apollo Server
   const apollo = new ApolloServer({
diff --git a/backend/src/server/plugins.ts b/backend/src/server/plugins.ts
index 3e0fc50e1..c4ffa4f3f 100644
--- a/backend/src/server/plugins.ts
+++ b/backend/src/server/plugins.ts
@@ -37,6 +37,7 @@ const logPlugin = {
     const { logger } = requestContext
     const { query, mutation, variables, operationName } = requestContext.request
     if (operationName !== 'IntrospectionQuery') {
+      logger.debug('requestDidStart:', requestContext)
       logger.info(`Request:
 ${mutation || query}variables: ${JSON.stringify(filterVariables(variables), null, 2)}`)
     }
diff --git a/backend/src/webhook/gms.ts b/backend/src/webhook/gms.ts
index b6d92fa25..7e26f6ca9 100644
--- a/backend/src/webhook/gms.ts
+++ b/backend/src/webhook/gms.ts
@@ -6,27 +6,32 @@
 import { User as DbUser } from '@entity/User'
 
 import { decode } from '@/auth/JWT'
-import { backendLogger as logger } from '@/server/logger'
+// import { backendLogger as logger } from '@/server/logger'
 
 export const gmsWebhook = async (req: any, res: any): Promise<void> => {
-  logger.info('GMS Hook received', req.body)
-  const { token } = req.body
+  console.log('GMS Hook received', req)
+  const { token } = req.query
 
   if (!token) {
-    logger.warn('gmsWebhook: missing token')
+    console.log('gmsWebhook: missing token')
     res.status(400).json({ message: 'false' })
     return
   }
+  console.log('gmsWebhook: found token=', token)
   const payload = await decode(token)
-  if (payload) {
-    const user = await DbUser.findOne({ where: { gradidoID: payload.gradidoID } })
-    if (!user) {
-      logger.warn('gmsWebhook: missing user')
-      res.status(400).json({ message: 'false' })
-      return
-    }
-    logger.info('gmsWebhook: authenticate user=', user)
+  console.log('gmsWebhook: decoded token=', payload)
+  if (!payload) {
+    console.log('gmsWebhook: invalid token')
+    res.status(400).json({ message: 'false' })
+    return
   }
-  logger.info('gmsWebhook: authentication successful')
-  res.status(200).json({ message: 'true' })
+  const user = await DbUser.findOne({ where: { gradidoID: payload.gradidoID } })
+  if (!user) {
+    console.log('gmsWebhook: missing user')
+    res.status(400).json({ message: 'false' })
+    return
+  }
+  console.log('gmsWebhook: authenticate user=', user)
+  console.log('gmsWebhook: authentication successful')
+  res.status(200).json({ userUuid: user.gradidoID })
 }