Is the mediation between Al Baraka Bank and car companies to submit loan applications for customers, which appears to be an interest-based transaction, considered a forbidden act?

It is not permissible to assist in usurious transactions in any way, because everyone who helps in them is a partner in sin. The Messenger of Allah, may Allah bless him and grant him peace, cursed the one who consumes Riba, its payer, its scribe, and its two witnesses, and he stated that they are all equal in sin. Therefore, one must abandon this work and repent to Allah, for whoever gives up something for the sake of Allah, Allah will compensate him with something better.