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The changes I made to the code include:
Changing the method signature of prepareRequest method to have a return type of array.
Replacing isset with $this->baseBotUrl ?? static::BASE_BOT_URL in the getBaseBotUrl method to check if $this->baseBotUrl is set and if it's not set, return static::BASE_BOT_URL.
Using type hints in method signatures to indicate the expected types of arguments and return values.
Using PHP 7.4 syntax for attribute property types and null coalescing operator.