Zapier - check member tier

I am trying to make an automation in Zapier that does the following:

IF reader checkouts on the £4 Tier or £6 Tier THEN email them with a Gumroad discount code.

But I cannot figure out how to specify the membership tier in Zapier and send it to new members on those tiers only.

Any help would be greatly appreciated.

I use Make for integrations, if that’s an option you can use Make’s free tier
and get the member’s Tier with the Watch Members module - it triggers
when you get a new member, and you can fire off an e-mail with the discount code
in the next step.

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