}
```

/// tip

Notice how the callback URL used contains the URL received as a query parameter in `callback_url` (`https://www.external.org/events`) and also the invoice `id` from inside of the JSON body (`2expen51ve`).

///

### Add the callback router { #add-the-callback-router }

/*
 * Copyright 2020 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

    if [ $ATTEMPTS -gt $LIMIT ]; then
      exit 1 ;
    fi ;
    sleep 2 ; # 1 second intervals between attempts
    $MC_COMMAND ;
    STATUS=$? ;
  done ;
  set -e ; # reset `e` as active
  return 0
}

# checkPolicyExists ($policy)
# Check if the policy exists, by using the exit code of `mc admin policy info`
checkPolicyExists() {
  POLICY=$1
  CMD=$(${MC} admin policy info myminio $POLICY > /dev/null 2>&1)
  return $?

<div class="screenshot">
<img src="/img/tutorial/separate-openapi-schemas/image02.png">
</div>

This means that it will **always have a value**, it's just that sometimes the value could be `None` (or `null` in JSON).

		}()
		runtime.Gosched()

		// unlock the manual lock
		nsLk.lockMapMutex.Unlock()

		// To trigger the race:
		// 1) lk3 or lk4 need to advance and increment the ref on the existing resource,
		//    successfully acquiring the lock.
		// 2) lk2 then needs to advance and remove the resource from lockMap.
		// 3) lk3 or lk4 (whichever didn't execute in step 1) then executes and creates

# vim: filetype=bash
#
# Copyright 2022 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,

set because it enables versioning to the Buckets created) if ! checkBucketExists $BUCKET; then if [ ! -z $OBJECTLOCKING ]; then if [ $OBJECTLOCKING = true ]; then echo "Creating bucket with OBJECTLOCKING '$BUCKET'" ${MC} mb --with-lock myminio/$BUCKET elif [ $OBJECTLOCKING = false ]; then echo "Creating bucket '$BUCKET'" ${MC} mb myminio/$BUCKET fi elif [ -z $OBJECTLOCKING ]; then echo "Creating bucket '$BUCKET'" ${MC} mb myminio/$BUCKET else echo "Bucket '$BUCKET' already exists." fi fi # set versioning...

set because it enables versioning to the Buckets created) if ! checkBucketExists $BUCKET; then if [ ! -z $OBJECTLOCKING ]; then if [ $OBJECTLOCKING = true ]; then echo "Creating bucket with OBJECTLOCKING '$BUCKET'" ${MC} mb --with-lock myminio/$BUCKET elif [ $OBJECTLOCKING = false ]; then echo "Creating bucket '$BUCKET'" ${MC} mb myminio/$BUCKET fi elif [ -z $OBJECTLOCKING ]; then echo "Creating bucket '$BUCKET'" ${MC} mb myminio/$BUCKET else echo "Bucket '$BUCKET' already exists." fi fi # set versioning...

--set rootUser=rootuser,rootPassword=rootpass123 --generate-name minio/minio ``` The command deploys MinIO on the Kubernetes cluster in the default configuration. The [configuration](#configuration) section lists the parameters that can be configured during installation. ### Upgrading the Chart You can use Helm to update MinIO version in a live release. Assuming your release is named as `my-release`, get the values using the command: ```bash helm get values my-release > old_values.yaml ``` Then change...

--set rootUser=rootuser,rootPassword=rootpass123 --generate-name minio/minio ``` The command deploys MinIO on the Kubernetes cluster in the default configuration. The [configuration](#configuration) section lists the parameters that can be configured during installation. ### Upgrading the Chart You can use Helm to update MinIO version in a live release. Assuming your release is named as `my-release`, get the values using the command: ```bash helm get values my-release > old_values.yaml ``` Then change...