Add User to RCP Subscription on Purchase

function pw_edd_add_customer_to_level( $payment_id = 0 ) {

	$user_id = edd_get_payment_user_id( $payment_id );

	if( $user_id <= 0 ) {

		return;

	}

	$downloads = edd_get_payment_meta_downloads( $payment_id );

	if( $downloads ) {

		$level = false;

		foreach( $downloads as $download ) {

			// Set the subscription level based on the product ID(s) purchased

			switch( $download['id'] ) {

				case 45:

					// Set the subscription level to add the user to

					$level = 4;

					break;

				case 742:

					break;

			}

		}

		if( ! empty( $level ) && function_exists( 'rcp_set_status' ) ) {

			// Give user one month of access

			$expiration = date( 'Y-m-d H:i:s', strtotime( '+1 month' ) );

			update_user_meta( $user_id, 'rcp_subscription_level', $level );

			update_user_meta( $user_id, 'rcp_expiration', $expiration );

			rcp_set_status( $user_id, 'active' );

		}

	}

}

add_action( 'edd_complete_purchase', 'pw_edd_add_customer_to_level' );