chore: release v0.8.1 (#143)

Co-authored-by: brendanjryan <1572504+brendanjryan@users.noreply.github.com>

Author: github-actions[bot]

.changelog/vast-mules-draw.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## 0.8.1 (2026-06-01)
+
+### Patch Changes
+
+- Added strict validation for payment method IDs, requiring them to match `1*LOWERALPHA` (lowercase letters only). Updated `Receipt` default method from empty string to `"tempo"` and fixed test fixtures to use valid method IDs. (by @EmmaJamieson-Hoare, [#142](https://github.com/tempoxyz/pympp/pull/142))
+
 ## 0.8.0 (2026-05-16)
 
 ### Minor Changes

CHANGELOG.md

@@ -1,6 +1,6 @@
 [project]
 name = "pympp"
-version = "0.8.0"
+version = "0.8.1"
 description = "Python SDK for the Machine Payments Protocol (MPP)"
 readme = "README.md"
 requires-python = ">=3.11"