If you target EU customers check e-invoicing https://en.wikipedia.org/wiki/PEPPOL to potentially integrate with a gateway. I don't think it's a lot of work and there are test gateways but I believe a lot, if not most, EU businesses who aren't transitioning to it this year will do so very soon and thus are looking for it.
Features:
- No Sign-Up Required + Instant PDF download
- Live PDF Preview
- Shareable Links
- Multiple Templates (incl. Stripe-style)
- Flexible Tax Support (VAT, GST, Sales Tax, and custom tax formats with automatic calculations)
- Multi-Language (Support for 10+ languages and all major currencies)
- Mobile-Friendly
GitHub: https://github.com/VladSez/easy-invoice-pdf
On holidays finished adding flexible tax support + other improvements: https://github.com/VladSez/easy-invoice-pdf/pull/163
Would love feedback, contributions, or ideas for other templates/features =)