4.20.0

What's Changed

• fix(ad-hoc): dynamic checkout spacings by @andrii-vysotskyi-cko in #323
• fix(ad-hoc): attributed string markdown by @andrii-vysotskyi-cko in #327
• feat(POM-407): expose invoice invalidation reason by @andrii-vysotskyi-cko in #328
• feat(ad-hoc): dynamic checkout start validation by @andrii-vysotskyi-cko in #330
• feat(ad-hoc): remove swiftgen by @andrii-vysotskyi-cko in #335
• feat(POM-398): card saving logic by @andrii-vysotskyi-cko in #334
• feat(POM-413): authorize invoice with apm by @andrii-vysotskyi-cko in #338
• feat(POM-410): deploy example to TestFlight by @andrii-vysotskyi-cko in #337
• feat(POM-305): migrate example to SwiftUI by @andrii-vysotskyi-cko in #339
• fix(ad-hoc): example linting issue by @andrii-vysotskyi-cko in #340
• feat(ad-hoc): remove markdown parsing assert by @andrii-vysotskyi-cko in #342
• feat(release): 4.20.0 by @processout-ci in #343

Full Changelog: 4.19.0...4.20.0