Please note, we are in the process of deploying the tool to all the hosts within PayPal Developer, so there may be occasions where you don't see the tool or you receive a "404" as you've hit a host where the tool hasn't been deployed yet. This should be resolved in a matter of days.
We also have another tool coming in the near future which I think a lot of people will find useful (REST-based). Stayed tuned for that announcement.
Happy Testing !
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