Hello all, I need to integrate my shopping cart with authorize.net using their SIM (simple integration method). This requires that I use the mhash function which unfortunately is not available in php on my server, yet. Based what what I have gathered from various sources, including here, I need to recompile php with mhash. Is this correct? If so, could anyone please give me or point me to a "step-by-step" instruction on how to do this while maintaining the same basic configuration I have now (in other words, just adding the mhash). I am a linux nOOb. I am on a Media Temple server running Red Hat Enterprise 3 and Plesk 7.5.2 in an "out of the box" configuration. I have php 4.3.2 installed. My phpinfo() page: https://o-secure.com/php_test.php Thanks for anything in advance!!!