Google has added a credit_type sub-attribute for the installment attribute, allowing you to specify whether the type of installment credit is lease or finance.
When submitting both the price value and the installment attribute, the value for the price will be considered as full cash vehicle price.
Ensure you use the Google Product Category values Vehicles & Parts > Vehicles > Motor Vehicles > Cars, Trucks & Vans or category id 916.
For example, when using a text-delimited file, your header will be:
| id | installment(months:amount:downpayment:credit_type) |
| abc123 | 36:500 USD:3999USD:lease |