fix: webhook validation with array parameter sorting Fixes #722

[robbie-terazo]

Fixes #722

Occasionally, sorting of an array parameter will put those parameters in a different order than when the signature was generated on the server. Establishing a sort order for both keys and values of array parameters ensures the same signature is generated when the array values appear in a different order.

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[childish-sambino]

🥇

Thanks for the fix!