Paypal protects buyers. Paypal will allow the other party to dispute the transaction after they have the source code. They will freeze significant amounts of money and could make it difficult to collect. <i>It is not an escrow service</i>; using it as one defeats the purpose of escrow.<p>My advice is to take it one step at a time to protect your interests. If the buyer wants your extension, then there are not abundant alternatives in the market.<p>First, ask the buyer what they have used in the past. This will provide information into their legitimacy and provide a starting point for your research.<p>Next, ask for a term sheet. Again, this is both a measure of legitimacy and a starting point.<p>Finally, ask for references regarding similar transactions.<p>If the other party doesn&#x27;t present themselves as experienced in this sort of thing, consider it a yellow flag. Don&#x27;t kid yourself that what looks like a red flag isn&#x27;t a red flag. International transactions are complex and getting your money won&#x27;t be easy if someone doesn&#x27;t want to pay.<p>If things are proper, the deal could easily close in thirty days or so. That&#x27;s not to suggest that you need to drag things out, only that it might be wise to take the time to perform some due diligence regarding the counter-party. Particularly since your experience is limited.<p>Good luck.