Fixed #80.
For those looking at the releases page, please be advised that even though we haven't made updates to the ExtPay JS library in a while, ExtensionPay is still a very active project! There are release notes for the server-based updates on every developer's ExtensionPay dashboard (at the bottom under extensions).
We're also excited to have a new version featuring multiple paid options within one extension in closed beta. If this interests you, please reach out via email to apply to become a beta tester!