During the channel configuration on Stays, you'll provide your email registered with PagBank (PagSeguro) login and the API key, known as authentication token on the channel's portal.

Check the step by step from the PagBank's (PagSeguro) website to get the API key.

After that, you must have to add it on Stays:

1. Access the [Finance > Auxiliaries > Payment channels] menu;
2. Select PagBank (PagSeguro) or register the channel;
3. Find the [API Settings] section;
4. Enter the information and save the changes.