Page Number position: pagecommand={thispagestyle{fancy}}

I have the following TeX file. It shows another PDF file. I want to add page number to the PDF pages. It adds but I want to customize the position. How to do it?

batchmode
documentclass[a4paper,]{article}
usepackage[papersize={432pt, 226pt}]{geometry}
usepackage[utf8]{inputenc}
usepackage{pdfpages}

begin{document}
includepdfmerge[pagecommand={thispagestyle{fancy}}]{/var/tmp/pdfjam-7FXkbO/source-1.pdf,-}
end{document}