feat(api): fix POST /invoice

internal/jtype/duration.go

@@ -0,0 +1,17 @@
+package jtype
+
+import (
+	"strings"
+	"time"
+)
+
+type Duration time.Duration
+
+func (d *Duration) UnmarshalJSON(b []byte) error {
+	dur, err := time.ParseDuration(strings.ReplaceAll(string(b), `"`, ""))
+	if err != nil {
+		return err
+	}
+	*d = Duration(dur)
+	return nil
+}