mpp-go

chore(deps): bump github.com/redis/go-redis/v9 in the go-deps group (#53)

chore(deps): bump actions/checkout from 6 to 6.0.2 in the actions group (#52)

docs: describe idempotent POST charge external IDs (#36)

fix(server): require default challenge expiry (#39)

test: convert tests to testify assertions (#48)