just a quick Q%A without the Q
1. Make sure res on computer and game is 1280X768
2. Best to use right after login to make sure packs have not been moved
3. Do dry runs with script to avoid losing item until you know your cordinates are set correctly. To do this make sure your main pack is open to a pack with nothing in it while testing. 
4. When doing dry runs open your Data.txt and enter some numbers in a line going down 1-10, like this
1
5
3
6
2
5
10
3
Save it.

5. Mouse movement is in the scrit to show you where the mouse is going, feel free to turn it off after you set everything. I suggest you leave it on. This way you know when the script is doing a check.

Resupply.exe- runs the program

resupply_ini.txt- modify setting and cordinates

deleteline.bat- use to delete the bottom line inyour data.txt file after suppling vendor with item

delete.bat- this will delete the Data.txt after it gets to zero items. Forces you to create a new data.txt, keep erros from happening from using the same txt file over and over. 

tmp.txt- file created during batch run. Basically the deleteline.bat runs. Reverses the numbers, deletes the top line, saves file to tmp.txt then flips file, and saves back to data.txt. trust me, its  batch file thing. 