Wix Studio Custom Payment Plugin

I need a Wix Studio expert to develop a standalone payment plugin for my site. The plugin should be able to handle cash transactions, as I am not looking to support online payment methods like credit/debit cards, PayPal, or cryptocurrency at this stage.

Ideal Skills:
- Extensive experience with Wix Studio
- Strong understanding of Wix Custom Payment Plugin
- Wix Velo objects
Please provide examples of similar work you've done in your proposal.