Zapier: Allow integrations to set complimentary tier membership

[naz]

original issue

Problem

Related: https://github.com/TryGhost/Team/issues/1271

Zapier is not configured to work with tiers. This applies both in terms of triggering events and actions that can be taken.

Real World Reference: https://forum.ghost.org/t/tiers-and-zapier/26019

Member Actions

For the most part, available member-related actions still work in the context of tiers. The only piece that needs updating is the ‘Complimentary premium plan’ option.

Current Version:

Solution:

• Instead of listing simply true / false, we would like to list the available tiers in the system and an option to remove all comps.
  • Note, The Zapier integration has no concept of Tiers at this moment. This change needs a bit of thinking around combining boolean "comped" flag and the tier selection.

For example, if I have the tiers ‘Bourbon’ and ‘Scotch’ I would see the following:

Bourbon
Create complimentary subscription to ‘Bourbon’ tier

Scotch
Create complimentary subscription to ‘Scotch’ tier

Remove complimentary subscriptions
Removes all existing complimentary subscriptions