This guide provides an overview of getting started with Plaid Transactions, which allows retrieval of user-authorized transaction and account data from thousands of financial institutions in the United States. The process involves three primary steps: initial submission of user information, completing Multi-Factor Authentication (MFA) responses as necessary, and retrieving available data. Key pieces of information required include API keys, banking credentials, Plaid institution code, MFA answers, and optional parameters such as webhook address. Webhooks are recommended for notifications on new transaction or account information availability.