ShardingSphere-Proxy supports LOCAL, XA, BASE transactions, LOCAL transaction is default value, it is original transaction of relational database.
Default XA transaction manager of ShardingSphere is Atomikos. Users can customize Atomikos configuration items through adding jta.properties in conf catalog of ShardingSphere-Proxy. Please refer to Official Documents of Atomikos for detailed configurations.
Since we have not packed the BASE implementation jar into ShardingSphere-Proxy, you should copy relevant jar which implement ShardingTransactionManager SPI to conf/lib, then switch the transaction type to BASE.