New features

• Greenfield: API for create an invoice refund (#4238, #4181) @bolatovumar
• Greenfield: Add metadata to invoice webhook event (#4370, #4223) @bolatovumar

Bug fixes

• Fix error HTTP 500 happening on Point of Sale (#4355, #4368) @NicolasDorier
• Some logos or images wouldn't show up properly if rootPath is used (#4367) @NicolasDorier
• Fix malformed manifest on PoS app (#4373, #4363) @dennisreimann
• Call to LND would start failing on some conditions @NicolasDorier
• Checkout v2: Fix for BIP21 case with default payment method other than onchain BTC (#4375) @dennisreimann

Improvement

• Adjust currency name to be standard (#4369) @bolatovumar
• Language update in checkout v1 for pt-BR and sv cultures

Miscalleneous

• Mark MySql and SQLite backend deprecated