Architecture is a single page application.

Category endpoint returns a JSON array of categories. Uses GET without parameters.

Select endpoint returns a JSON array of data, including links to attached PDFs. Uses GET with parameters: from_date to_date category - from drop down, multiple entries amount - return all RFPs whose amount range includes this value

This URL can be passed around.

PDFs are stored in base/{RFP id}/filename directories.

Open question - is amount in thousands?