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public function generate_coupon_code(): string { $characters = apply_filters( 'woocommerce_coupon_code_generator_characters', 'ABCDEFGHJKMNPQRSTUVWXYZ23456789' ); $char_length = apply_filters( 'woocommerce_coupon_code_generator_character_length', 8 ); $prefix = apply_filters( 'woocommerce_coupon_code_generator_prefix', '' ); $suffix = apply_filters( 'woocommerce_coupon_code_generator_suffix', '' ); return $prefix . substr( str_shuffle( $characters ), 0, $char_length ) . $suffix; }