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# [6.1.0-rc] - PHP eSignature Client

In this update to the PHP eSignature SDK, we've added nullable properties for the default initialization, support for version v2.1-21.1.01 of the Docusign eSignature API, and have updated the SDK release version.accessed without initializing.

[Learn More](https://github.com/docusign/docusign-php-client/blob/master/CHANGELOG.md)