private function add_required_block_fields( $fields_to_require, $blocks, $location ) {

		$blocks_to_add = array();
		foreach ( $fields_to_require as $field_id => $block_to_add ) {

			// If a reusable block exists for the field, use it. Otherwise use a dynamically generated block from the template schema.
			$use_reusable = LLMS_Form_Templates::find_reusable_block( $block_to_add );
			$block        = LLMS_Form_Templates::get_block( $block_to_add, $location, $use_reusable );

			if ( $use_reusable ) {
				// Load reusable block.
				$_blocks = LLMS_Forms::instance()->load_reusable_blocks( array( $block ) );
				// The reusable block doesn't contain the needed block, use a dynamically generated block from the template schema.
				if ( empty( $_blocks ) || ! $this->find_block( $field_id, $_blocks ) ) {
					$_blocks = array( LLMS_Form_Templates::get_block( $block_to_add, $location, false ) );
				}
				$block = $_blocks[0];
			}

			$blocks_to_add[] = $block;
		}

		// Make blocks to add visible.
		$blocks_to_add = 'checkout' === $location ? array_map( array( $this, 'make_all_visible' ), $blocks_to_add ) : $blocks_to_add;

		return array_merge(
			$blocks,
			$blocks_to_add
		);

	}