if (!strcmp(op, "fill")) {
                credential_fill(&c);
-               if (c.username)
-                       printf("username=%s\n", c.username);
-               if (c.password)
-                       printf("password=%s\n", c.password);
+               credential_write(&c, stdout);
        } else if (!strcmp(op, "approve")) {
                credential_approve(&c);
        } else if (!strcmp(op, "reject")) {