Aditya, I have been there. A PDF opens up which is in Spanish but it doesn't talk about the fees or money order anywhere in the document.
You pay the visa fee during your interview in the form of a money order. The fee amount is somewhere here below depending on the visa type: http://www.exteriores.gob.es/Consulados/CHICAGO/es/ServiciosConsulares/Serviciosconsularesenchicago/Paginas/Tasas-Consulares.aspx
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