You can generate as many key as you want in , just scroll down a bit and you’ll find this Click on Generate API Token to open the token generation dialog box.
You can create a token without restriction (giving access to all of your docs) or chose a specific doc or table.
This token will be shared in your Unity project (even if it is hidden, see ) and if security is an important topic in your project/company, you can restrict the token a little bit here. You should give read and write access, especially if you plan to use that will write in your document (adding a reference to specific assets you would like to have in your tables). Once the Token is generated you can copy it to paste it later in the requester API Key field.