\ProvidesFile{iso-numeric.cbx}
  [2022/03/20 v0.4.1 ISO 690 biblatex citation style]

\RequireCitationStyle{numeric}
\RequireCitationStyle{iso-fullcite}

% Format \parencite with parentheses instead of brackets
\DeclareCiteCommand{\parencite}[\mkbibparens]% <---- was \mkbibbrackets
  {\usebibmacro{prenote}}
  {\usebibmacro{citeindex}%
   \usebibmacro{cite}}
  {\multicitedelim}
  {\usebibmacro{postnote}}

\endinput