The TMDB API is a resource for any developers that want to integrate movie, TV show, and cast data along with posters or movie fan art. 

This article explains, how to get the TMDB API key, please follow the steps,

• Go to TMDB website. Click here
• If you have an account then click Login button. Click Join TMDb for creating a new account.
• Login to the account with Username and Password.
  
  
• Go to Profile and Settings section and click Settings option.
  
  
  
• On the redirected page, click API tab at the left side of the window.
  
  
  
• You have to submit a request to generate the API key.
  
  
  
  
• Provide the required informations and click the submit button.
• On the redirected page, you can copy the TMDB API key. You need to add the API key while configuring the SetupOTT VoD module.