If you have all the elements available at the beginning of the project with Sellermania, the configuration of your new account can be quick. You must of course follow the procedure for closure of your account with your former feed manager. If at the same time your Sellermania account has been set up, you can cut off the sending of feeds from your former feed manager and activate the sending of Sellermania to the marketplaces.
We provide an API kit by default and we have a Sellermania module for PrestaShop.