email-tag-requirements.txt

TribeInvitation
  - invitor
  - (custom) url
  
TribeMembership
  - tribe
  - user
  - (custom) memberships_url

Order
  - amount_paid
  - monetary_gift
  - tribe
  - line_items
  - formatted_created_at

LineItem
  - quantity
  - product

Product
  - name

TribeBlogpost
  - tribe
  - (custom) url

Referral
  - sender_name

Tribe
  - beneficiary_name
  - founder
  - name
  - story
  - (custom) url
  - (custom) beneficiary_claim_url

User
  - name
  - (custom) confirmation_url
  - (custom) edit_password_reset_url