This is a maintenance release.
- Update Guzzle to latest version
- Update PHPUnit to latest version
- Update SSL certificate
- Update tests to work properly with latest PHPUnit version
- Fix issue in getTimestamp function
- Remove Orders API
- Remove Checkouts API
- Remove Merchant API
Note: The removed APIs are no longer available in the Coinbase API, they have been moved to Coinbase Commerce. There is an official repository for the Coinbase Commerce PHP Client.