Use HTTP_Referer to select pool

One correction and one tweak. According to URI::host, it only returns the host, not the protocol associated with it, so just remove "http://" from the string:

when HTTP_REQUEST { 
    set referrer_host [URI::host [HTTP::header value Referer]]
    if { $referrer_host eq "remotepay-pt.test.com" } { 
        pool REMOTEPAY_7080 
    } else {
        pool REMOTEPAY_80 
    } 
}

You could also remove the variable since it's only called once...

when HTTP_REQUEST { 
    if { [URI::host [HTTP::header value Referer]] eq "remotepay-pt.test.com" } { 
        pool REMOTEPAY_7080 
    } else {
        pool REMOTEPAY_80 
    } 
}