# Purchase Just write me a private message at the Xojo Forum () with your valid e-mail address and tell me which version of StackView you'd like to order. I’ll sent you the invoice about **15 €** and after purchasing via PayPal you’ll get the unencrypted source code. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://xojo.gitbook.io/add-ons/stackview/purchase.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.