Add Contact Form 7 to the Profile page when using the Member Directory and Profiles Add On for Paid Memberships Pro.

append_profile_page_with_cf7.php

<?php
/**
 * Add Contact Form 7 to the Profile page when using the Member Directory and Profiles Add On for Paid Memberships Pro.
 * Update line 36 with the correct CF7 shortcode for your desired form to display.
 * Add a hidden field to your form: "[hidden send-to-email default:shortcode_attr]".
 * Set the "To" field of the Contact Form to "[send-to-email]".
 *
 */

// Allow custom shortcode attribute for "send-to-email". 
function custom_shortcode_atts_wpcf7_filter( $out, $pairs, $atts ) {
	$my_attr = 'send-to-email'; 
	if ( isset( $atts[$my_attr] ) ) {
		$out[$my_attr] = $atts[$my_attr];
	}
	return $out;
}
add_filter( 'shortcode_atts_wpcf7', 'custom_shortcode_atts_wpcf7_filter', 10, 3 );

// Add the contact form to the profile page using Contact Form 7.
function append_profile_page_with_cf7( $content ) {
	global $pmpro_pages;

	//Get the profile user
	if ( isset( $_REQUEST['pu'] ) ) {
		if ( is_numeric($_REQUEST['pu'] ) ) {
			$pu = get_user_by( 'id', $_REQUEST['pu'] );
		} elseif( ! empty( $_REQUEST['pu'] ) ) {
			$pu = get_user_by( 'slug', $_REQUEST['pu'] );
		} else {
			$pu = false;
		}
	}

	if ( ! empty( $pu ) && shortcode_exists( 'contact-form-7' ) && is_page( $pmpro_pages['profile'] ) ) {
		$content .= do_shortcode( '[contact-form-7 id="271" title="Contact form 1" send-to-email="' . $pu->user_email . '"]' );
	}
	return $content;
}
add_filter( 'the_content', 'append_profile_page_with_cf7' );

Here is the hidden field you need to add to your form: [hidden send-to-email default:shortcode_attr]

Add to form "To" field [send-to-email] (you will get an error message)

This recipe is included in the blog post on "How to show a dynamic “Contact Member” form on your directory profile pages." at Paid Memberships Pro here: https://www.paidmembershipspro.com/how-to-show-a-dynamic-contact-member-form-on-your-directory-profile-pages/