How to select pool based on http payload ...

Guys

Thanks for all. After few test I use ..

when HTTP_REQUEST { if { ([HTTP::method] eq "POST") } { HTTP::collect [HTTP::header Content-Length] } }

when HTTP_REQUEST_DATA { set decoded [decode_uri [HTTP::payload]] log local0. "=== Decoded $decoded"

set ini [string first "\"idBiller\"" $decoded]
if { $ini != -1 } {
    set end [string first "," $decoded $ini]
    set value [string range $decoded $ini [expr {$end-1}]]
    set idBiller [lindex [split $value ":"] 1]
    log local0. "=== ID Biller: $idBiller ==="
    switch -exact $idBiller {
        94950004 {
            pool Pool_recarga_XXX
            log local0. "=== Sali por TASA ==="
        }
        default {
            pool Pool_recarga_YYY
            log local0. "=== Sali por Default ==="
        }
    }
}

}