Maybe just make it simple. Create and publish a simple form for vendors to fill out with important contact information like phone and email. If you like their vendor idea or accept them you can then send them an invoice to pay – either direct link to paypal or a WooCommerce donation or something like Sliced Invoices. Looking into this I found a plugin that seems to combine the best of both worlds WooCommerce and Sliced Invoices called Woo Invoices.
If they don’t pay on time they don’t get a spot and you email them telling them so or something similar. I can’t say this is something I’ve done before but if you’re looking for a free route to put this together the above may work in your favor.
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