A Google Ads account and Merchant Center is required for advertising on Google and Facebook. If you do not have a Google Ads account or Merchant Center, you can have both created during the registration process via emarketing. These will be created in the name of the emarketing user, which means he has full access to them and they will belong to him even after the cooperation has ended.
IMPORTANT: After emarketing has created a Google Ads account for you, Google will send you an email. The link contained in the email will allow you to login to your Google Ads account. Please log in and provide payment information, otherwise the ads of your campaigns cannot be played.
Unfortunately, it is not technically possible to create a Facebook Ads account. Under the following link you can read how to create an ad account: https://www.facebook.com/business/help/910137316041095?id=420299598837059