Expiration date of unique coupon code in a FLOW setting

Hi everyone,

I want to create a flow that sends out a unique coupon code which is valid for 7 days.

Now, from what I understand, Klaviyo will “request” a code from Shopify once someone reaches that stage in the flow, and Shopify will create 100 codes with an expiration date that’s 7 days in the future. 

Now my question is:

What if another customer reaches that step in the flow, say, 3 days later? Will Klaviyo send one of the 100 pre-generated codes (99 still being unused)? If so, will the expiration date be 3 days later for this code or not?

Or will Klavio request a new set of 100 codes with Shopify that feature the “later” expiration date? (which would be very wasteful!)

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Please explain in detail how this works!

Thx