How to make first name and last name mandatory ?

Hello,

1> can you provide code for Affiliate form ?
>> What we understand that you want to make firstname&lastname require field for affiliate registration, Add this below code to your child theme’s functions.php
In case you do not have child theme then add code using this plugin – https://wordpress.org/plugins/code-snippets/

add_filter( 'wcfm_affiliate_registration_fields', function( $aff_registration_fields ) {
	if( isset( $aff_registration_fields['first_name'] ) ) {
		$aff_registration_fields['first_name']['custom_attributes'] = array( 'required' => 1 );
	}
	if( isset( $aff_registration_fields['last_name'] ) ) {
		$aff_registration_fields['last_name']['custom_attributes'] = array( 'required' => 1 );
	}
	return $aff_registration_fields;
}, 50 );

2> both Affiliate form and Vendor form modified files (please share also file names) are not effected by any plugins update ?
>> For this requirement we have send you the script which is using wordpress “filter”. Any file modification is not required. You don’t need to any modification in core file plugin so this customization will not effected by any plugins update.
3>why don’t make it simple for everybody and put on all fields (except the primary key one) an on/off switch like for added ones, so in this way you can avoid all international differences and help a persona customization ?
>> Do you want a settings(on/off) which will decide the registration field will be required or not?
In this case, our WCFM plugins have “filters”, so easily you can achieve this requirement by adding two lines of code.That’s why we don’t have added more settings for this.

as my final target is a big project, how much does it cost a specialized and focused remote code worker ?
>>Please contact us here for the purpose – https://wclovers.com/woocommerce-multivendor-customization/ with Scope of work for your site.

Thanks.