getBestValueOffer
Returns the offer with the lowest recurring cost per month, comparing plans of different cadences on equal terms.
This is the "best value" badge on a paywall: a yearly plan at $59.99 beats a monthly at $9.99 because it normalizes to ~$5.00/month. Offers whose period or price could not be resolved are skipped.
Return
The cheapest-per-month offer, or null when none can be normalized.
Since
4.4.0
Parameters
productId
Subscription product id.