+extern int afb_cred_has_permission(struct afb_cred *cred, const char *permission, const char *context);
+
+extern const char *afb_cred_export(struct afb_cred *cred);
+extern struct afb_cred *afb_cred_import(const char *string);
+
+extern struct afb_cred *afb_cred_mixed_on_behalf_import(struct afb_cred *cred, const char *context, const char *exported);