How to pass data to wordpress page (without GET parameter)

It’s completely possible to achieve this by using custom rewrite rules. Right now I don’t have the opportunity to give you the actual code for it, but you can check the documentation for add_rewrite_rule() in the Codex. It’s pretty straightforward if you add a custom parameter to the rewritten URL.

Actually, you already have the almost exact parameters for the function in your question.

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