def METHOD_NAME(s3_bucket_name):
    iam_client = create_iam_client()
    user_name = "s3-data-access-user-" + s3_bucket_name
    user_name = user_name[:63] # limited to 63 characters
    user_info = iam_client.create_user(UserName=user_name)
    s3_policy = get_or_create_s3_access_policy(s3_bucket_name)
    iam_client.attach_user_policy(UserName=user_name, PolicyArn=s3_policy['Arn'])
    iam_resource = create_iam_resource()
    iam_user = iam_resource.User(user_name)
    access_key_pair = iam_user.create_access_key_pair()
    return {
        "BEIWE_SERVER_AWS_ACCESS_KEY_ID": access_key_pair.access_key_id,
        "BEIWE_SERVER_AWS_SECRET_ACCESS_KEY": access_key_pair.secret_access_key,
    }