PMT is a simple tool that can merge for you multiple pdf file to one file using a python code.
git clone https://github.com/ShyGorilla/pdf_merging_tool.git
// Cloninng the tool
cd pdf_merging_tool
// Change the directory to the tool
pip3 install -r requirements.txt
// Install requirements
python3 pdf.py
// To run the tool
or you can do all that with only one command to copy
git clone https://github.com/ShyGorilla/pdf_merging_tool.git ; cd pdf_merging_tool ; python3 pdf.py