code: function maybeWithinRefundPeriod( purchase ) {
  	if ( isRefundable( purchase ) ) {
  		return true;
  	}
  
  	// This looks at how much time has elapsed since the subscription date,
  	// which should be relatively reliable for new subscription refunds, but
  	// not renewals. To be completely accurate, this would need to look at the
  	// transaction date instead, but by definition this function needs to work
  	// in scenarios where we don't know exactly which transaction needs to be
  	// refunded.
  	// Another source of uncertainty here is that it relies on the user's
  	// clock, which might not be accurate.
  	return (
  		'undefined' !== typeof purchase.subscribedDate &&
  		'undefined' !== typeof purchase.refundPeriodInDays &&
  		moment().diff( moment( purchase.subscribedDate ), 'days' ) <= purchase.refundPeriodInDays
  	);
  }
docs: Checks if a purchase might be in the refund period, whether refundable or not.
  
  If you need to determine whether a purchase can be programmatically refunded
  via the WordPress.com API, use isRefundable() instead.
  
  This function attempts to catch some additional edge cases in which a
  purchase is refundable by policy but where isRefundable() returns false and
  which would therefore require the assistance of a Happiness Engineer to
  actually refund it.
  
  The results aren't guaranteed to be reliable, so don't use them to promise
  or deny a refund to a user. Instead, for example, use it to decide whether
  to display or highlight general help text about the refund policy to users
  who are likely to be eligible for one.
  
  @param {Object} purchase - the purchase with which we are concerned
  
  @returns {Boolean} Whether in refund period.