# API documentations

- [Zapier Intergation](/api-documentations/zapier-intergation.md)
- [API Authentication](/api-documentations/api-authentication.md): How to authenticate all API requests
- [Email Validation API](/api-documentations/email-validation-api.md): Validate email using the API
- [Campaign API](/api-documentations/campaign-api.md)
- [List all campaigns](/api-documentations/campaign-api/list-all-campaigns.md): How to list all campaigns on a workspace
- [Add prospect to campaign](/api-documentations/campaign-api/add-prospect-to-campaign.md): Add new prospect to an existing campaign