create e-mail responses with fastmail and OpenAI

Workflow Description: This n8n workflow automates the drafting of email replies for Fastmail using OpenAI's GPT-4 model. Here’s the overall process: Email Monitoring: The workflow continuously monitors a specified IMAP inbox for new, unread emails. Email Data Extraction: When a new email is detected, it extracts relevant details such as the sender, subject, email body, and metadata. AI Response Generation: The extracted email content is sent to OpenAI's GPT-4, which generates a personalized draft response. Get Fastmail Session and Mailbox IDs: Connects to the Fastmail API to retrieve necessary session details and mailbox IDs. Draft Identification: Identifies the "Drafts" folder in the mailbo

Help me set up the n8n workflow "create e-mail responses with fastmail and OpenAI" (https://n8n.io/workflows/2441). It uses: HTTP Request, OpenAI. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.