The context is TRANSFER webhook event. I assume the two lists always have the same length. So we have a one-to-one transfer map, like transferred_from[k] to transferred_to[k]. Is my assumption correct?
Solved
Do "transferred_from" and "transferred_to" always have the same number of elements?

Best answer by Yousef
Not always, these will be arrays of App User ID’s, which can be one or more depending on the amount of aliases that the customer has. It may look like this for example,
"transferred_from": ["$RCAnonymousID:123452686c894a6a91e812725e6f1158"],
"transferred_to": ["$RCAnonymousID:67894ce91fb40d897d57e6fdb884ef3", "304745522234"]
This paragraph may also be helpful for understanding why this is: What is a customer in RevenueCat?
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