Recently Google introduces base plans to subscriptions. Base plans are used to introduce different billing period (you end up with single subscription and couple of base plans for example: monthly, weekly, yearly) https://support.google.com/googleplay/android-developer/answer/12154973?hl=en
When I verify subscription on backend I would like to know which base plan user selected but I cannot find any way to get that. Previously I was getting all necessary informations from:
https://developers.google.com/android-publisher/api-ref/rest/v3/purchases.subscriptions
when Google introduced Base plans they also released purchases.subscriptionsv2:
https://developers.google.com/android-publisher/api-ref/rest/v3/purchases.subscriptionsv2
but both only returns productId which is subscription id and no base plan id. Any idea how to get that with service account authentication?
On the other hand I can see on Google Play Console under order details productId and selected base plan, so I know subscription is configured correctly
Google added new field offerDetails with basePlanId, offerId and offerTags into lineItems (https://developer.android.com/google/play/billing/compatibility#subscriptionpurchasev2-fields). Fields not documented yet in https://developers.google.com/android-publisher/api-ref/rest/v3/purchases.subscriptionsv2, but already come in response.