diff --git a/include/api.sh b/include/api.sh
new file mode 100644
index 0000000..1942e3e
--- /dev/null
+++ b/include/api.sh
@@ -0,0 +1,119 @@
+#!/usr/bin/env bash
+
+# Copyright 2019 Richard Bukovanský
+#
+# 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,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# Author: Richard Bukovanský, richard.bukovansky@gmail.com
+# This file is part of Bashing Altassian project
+# https://github.com/rbukovansky/BashingAtlassian
+#
+# SPDX-License-Indentifier: Apache-2.0
+
+# Script running switches
+set -o errexit
+set -o pipefail
+set -o nounset
+# set -o xtrace
+
+# LOAD LIBRARIES
+source "${scriptDirectoryPath}/include/configuration.sh"
+
+# FUNCTIONS
+function __BA:API:Get() {
+	local applicationKey="$1"
+	local apiName="$2"
+	local apiResource="$3"
+
+	# public variable apiURL is set
+	if ! __BA:Configuration:Load "${applicationKey}" "${apiName}" "${apiResource}"; then
+		printf "Loading environment configuration failed.\n\n"
+		exit 1
+	fi
+
+	local response=$(curl --silent --header "Content-Type: application/json" --header "Accept: application/json" -X GET ${apiSecureConnection} --user "${apiCredentials}" "${apiURL}")
+	local responseReturnCode=$?
+
+	if [[ $responseReturnCode -ne 0 ]]; then
+		printf "Loading data from REST API with GET method failed.\n\n"
+		exit 1
+	fi
+
+	BAAPIResponse="${response}"
+}
+
+function __BA:API:Post() {
+	local applicationKey="$1"
+	local apiName="$2"
+	local apiResource="$3"
+	local payload="$4"
+
+	# public variable apiURL is set
+	if ! __BA:Configuration:Load "${applicationKey}" "${apiName}" "${apiResource}"; then
+		printf "Loading environment configuration failed.\n\n"
+		exit 1
+	fi
+
+	local response=$(curl --silent --header "Content-Type: application/json" --header "Accept: application/json" -X POST -d "${payload}" ${apiSecureConnection} --user "${apiCredentials}" "${apiURL}")
+	local responseReturnCode=$?
+
+	if [[ $responseReturnCode -ne 0 ]]; then
+		printf "Sending data to REST API with POST method failed.\n\n"
+		exit 1
+	fi
+}
+
+function __BA:API:Put() {
+	local applicationKey="$1"
+	local apiName="$2"
+	local apiResource="$3"
+	local payload="$4"
+
+	# public variable apiURL is set
+	if ! __BA:Configuration:Load "${applicationKey}" "${apiName}" "${apiResource}"; then
+		printf "Loading environment configuration failed.\n\n"
+		exit 1
+	fi
+
+	local response=$(curl --silent --header "Content-Type: application/json" --header "Accept: application/json" -X PUT -d "${payload}" ${apiSecureConnection} --user "${apiCredentials}" "${apiURL}")
+	local responseReturnCode=$?
+
+	if [[ $responseReturnCode -ne 0 ]]; then
+		printf "Sending data to REST API with PUT method failed.\n\n"
+		exit 1
+	fi
+
+	BAAPIResponse="${response}"
+}
+
+function __BA:API:Delete() {
+	local applicationKey="$1"
+	local apiName="$2"
+	local apiResource="$3"
+
+	# public variable apiURL is set
+	if ! __BA:Configuration:Load "${applicationKey}" "${apiName}" "${apiResource}"; then
+		printf "Loading environment configuration failed.\n\n"
+		exit 1
+	fi
+
+	local response=$(curl --silent --header "Content-Type: application/json" --header "Accept: application/json" -X DELETE ${apiSecureConnection} --user "${apiCredentials}" "${apiURL}")
+	local responseReturnCode=$?
+
+	if [[ $responseReturnCode -ne 0 ]]; then
+		printf "Deleting data from REST API with DELETE method failed.\n\n"
+		exit 1
+	fi
+
+	BAAPIResponse="${response}"
+}