Deprecated warnings

[MMildnerTCT]

Hi,

I'm getting Deprecated warnings on PHP 8.1 when creating a session key:

Deprecated: Academe\Opayo\Pi\Security\SensitiveValue implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary) in /PATH/vendor/academe/opayo-pi/src/Security/SensitiveValue.php on line 9

Deprecated: Return type of Academe\Opayo\Pi\Security\SensitiveValue::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /PATH/vendor/academe/opayo-pi/src/Security/SensitiveValue.php on line 67

Deprecated: Return type of Academe\Opayo\Pi\Request\CreateSessionKey::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /PATH/vendor/academe/opayo-pi/src/Request/CreateSessionKey.php on line 30

Deprecated: Return type of Academe\Opayo\Pi\Response\SessionKey::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /PATH/vendor/academe/opayo-pi/src/Response/SessionKey.php on line 125

I have turned off the warnings for now.

Thanks,
Martin