True ETL Tools
If you need more than just to copy data from Productive.io to Google BigQuery, you may use Skyvia's powerful ETL functionality for Productive.io and Google BigQuery integration. Skyvia's Import tool will correctly extract Productive.io data, transform it, and load to Google BigQuery when Google BigQuery tables have different structure than Productive.io objects. Besides, if you ever need to load data back from Google BigQuery to Productive.io, Skyvia Import allows loading data in any direction, supporting Reverse ETL scenario.
For more complex cases, you can use Data Flow and Control Flow tools. They are designer-based solutions for creating complex data pipelines, involving not only Productive.io and Google BigQuery connectors, but any number of connectors in one integration. With these tools you can automate data workflows, involving custom logic, complex multistage transformations, combine data from different sources, load them into multiple destinations at once and many more.