Matt B comments

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                                            Matt B

Deprecated: Return type of net\authorize\api\contract\v1\MerchantAuthenticationType::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/html/vendor/authorizenet/authorizenet/lib/net/authorize/api/contract/v1/MerchantAuthenticationType.php on line 261

Is there a manual fix for this issue? I need to get this code up and running.

Deprecated: Return type of net\authorize\api\contract\v1\MerchantAuthenticationType::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/html/vendor/authorizenet/authorizenet/lib/net/authorize/api/contract/v1/MerchantAuthenticationType.php on line 261

> Yes, you can manually change all 174 files like "zhartaunik" did. Or, you can just do what I did and use his version " https://github.com/zhartaunik/authorizenet-sdk-php" and don't update unless...

Deprecated: Return type of net\authorize\api\contract\v1\MerchantAuthenticationType::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/html/vendor/authorizenet/authorizenet/lib/net/authorize/api/contract/v1/MerchantAuthenticationType.php on line 261

I'm at a loss here. I tried what you said, still didn't work. I found that people were saying 2.02 worked. I tried that, still doesn't work. 2.02 brings back...