Function StampPDFFileWithPDFFile
Stamps a pdf file with a pdf file.
Parameters:
string sourceFilename: Filename of the source pdf file
string destinationFilename: Filename of the destination pdf file
string imageFilename: Filename of the image
int fromPage: First page to add the stamp
int toPage: Last page to add the stamp
bool overUnder: Determines if stamp is placed above or below the existing content
float fillOpacity: Opacity of the image
int blendMode: Blend mode
Return Value:
int