leland_learndash_update_course_meta.php

/* No warranty or support offered. Please use at your own risk */

function leland_learndash_update_course_meta() {
	$course_args = array(
		'post_type'  => 'sfwd-courses',

		// Please be careful with unbounded queries
		// This is not going to work well if you have a lot of courses
		// Test on a staging/dev server first!
		'posts_per_page'  => -1,
	);
	
	$course_query = new WP_Query( $course_args );
	
	if ( $course_query->have_posts() ) {
		while ( $course_query->have_posts() ) {
			$course_query->the_post();

			// Get the course meta
			$meta = get_post_meta( $course_id, '_sfwd-courses', true );

			// Update access mode to "Buy Now"
			$meta['sfwd-courses_course_price_type'] = 'paynow';
	
			// Change price to "4"
			$meta['sfwd-courses_course_price'] = '4';
	
			update_post_meta( get_the_ID(), '_sfwd-courses', $meta );
		}
	}
	
}
add_action( 'init', 'leland_learndash_update_course_meta' );