Hmac header changed?

Shopify Partner
6 0 1

Hi all,

we've had webhooks set up on our site for a few years now without issue. However when we upgraded our services to PHP 8.1 from PHP 8 our webhooks stopped validating. Upon investigation it seems that we're now getting the


header rather than the 


However according to this doc - we should still be getting the uppercase / underscore version. Is this an intentional change or a known issue?

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