We recommend using draw.io service while working with flowcharts.
Keep in mind, whenever you export your flowchart PNG file - make sure you have the following settings in your "export" window:
This will provide a high resolution quality for the rendered images.
Every flowchart file in Falcon Docs must be located in
/img/opensource folder next to the rendered PNG file with the same
/img/opensource/payment-workflow.png is a rendered image of
/img/opensource/payment-workflow.xml flowchart file.
Make sure you always follow this convention and keep both files updated and tracked by GIT.