Documentation on generating access token for successful integration of Calendly
Follow the below instructions to generate Calendly Access Token

• Login to your Calendly account
• Go to Integrations Page
• Select API & Webhook tile
• If you have no prior personal access tokens, select Get a token now under Personal Access Tokens
• If you already have a token, select Generate new token under Your personal access tokens
• At Create your personal access token window, create an identifiable name for your token and select Create Token, then Copy token.