The General Data Protection Regulation (GDPR) is a strict privacy and security law that applies to organizations handling data related to people in the European Union. Violations can result in harsh fines, reaching into the tens of millions of euros. Pseudonymisation is a standard requirement for data used in statistical production under GDPR. Airbyte, an ELT tool, has introduced a low-code connector framework that enables users to build source connectors for REST APIs by modifying boilerplate YAML files. This tutorial demonstrates how to incorporate "tweak" transformation functionality into a low-code connector configuration to pseudonymise sensitive fields, remove sensitive fields and records, and limit data sent to the destination.