closes https://github.com/TryGhost/Team/issues/1864
refs https://github.com/TryGhost/Team/issues/1881
- triggers free member email alert via event dispatch from member create method
- passes subscription/stripe data to member creation for paid members so free member alert can be ignored for them
- moves subscription created event being called from webhook controller to `linkSubscription`, allows creating subscription events for all new subscriptions instead of ones just via webhooks
refs https://github.com/TryGhost/Team/issues/1808
refs https://github.com/TryGhost/Team/issues/1809
refs https://github.com/TryGhost/Team/issues/1820
refs https://github.com/TryGhost/Team/issues/1814
### Changes in `member-events` package
- Added MemberCreatedEvent (event, not model)
- Added SubscriptionCreatedEvent (event, not model)
### Added `member-attribution` package (new)
- Added the AttributionBuilder class which is able to convert a url history to an attribution object (exposed as getAttribution on the service itself, which handles the dependencies)
```
[{
"path": "/",
"time": 123
}]
```
to
```
{
"url": "/",
"id": null,
"type": "url"
}
```
- event handler listens for MemberCreatedEvent and SubscriptionCreatedEvent and creates the corresponding models in the database.
### Changes in `members-api` package
- Added urlHistory to `sendMagicLink` endpoint body + convert the urlHistory to an attribution object that is stored in the tokenData of the magic link (sent by Portal in this PR: https://github.com/TryGhost/Portal/pull/256).
- Added urlHistory to `createCheckoutSession` endpoint + convert the urlHistory to attribution keys that are saved in the Stripe Session metadata (sent by Portal in this PR: https://github.com/TryGhost/Portal/pull/256).
- Added attribution data property to member repository's create method (when a member is created)
- Dispatch MemberCreatedEvent with attribution
### Changes in `members-stripe-service` package (`ghost/stripe`)
- Dispatch SubscriptionCreatedEvent in WebhookController on subscription checkout (with attribution from session metadata)
refs https://github.com/TryGhost/Team/issues/1726
Free trial offers don't have a Stripe coupon created for them, as the trial is directly added to checkout session. So for mapping a subscription to offer, we pass the offer id directly from checkout metadata to link the subscription in backend with right offer data. This also handles the case where the offer id against a subscription can get overwritten for a subsequent subscription event, as the sub event from Stripe doesn't has the trial offer info.
- handles storing an offer id for a subscription
- updates member detail in Admin to show the offer info for a subscription
refs https://github.com/TryGhost/Team/issues/1490
With multiple newsletters, paid members can choose their newsletter preference at the time of signup via Portal. This change handles the newsletter preference via stripe checkout metadata and stores it against the member on completing signup.
refs https://github.com/TryGhost/Team/issues/1374
We cannot update payment details for members which we don't know about,
so returning and giving a successful response to Stripe is the correct
thing to do.
