ManyChat’s API does not currently allow checking if a WhatsApp number or WhatsApp ID exists as a subscriber. This is a basic requirement for any serious integration.
A direct endpoint is needed to avoid:
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Errors when creating already existing subscribers
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Unnecessary API calls
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Data duplication and inconsistencies
It should return whether the number is linked to a subscriber Id or not.
Without this, it's not possible to validate data before operating.
Hope this gets added soon.