You used a personal credit card for Google Cloud expenses and your company wants those project charges on the company invoice. What should you do?

The correct solution is to change your projects' billing account to the company's billing account. This directly transfers the financial responsibility for your projects from your personal billing account to the company's, ensuring all future charges appear on the company's invoice. Granting finance the Billing Account User IAM role on your personal billing account would give them access to your personal billing, which is inappropriate and doesn't transfer the project charges. Enabling BigQuery billing export and granting query access provides data about spending but doesn't change the billing account responsible for the charges. Opening a Google Billing Support ticket might be a step for complex issues, but the direct and standard way to reassign project billing is to change the billing account associated with the projects.