Here is how to create oauth1 api credential in n8n
- First click on the "Create workflow" button dropdown arrow.
- Then click on "Create credential" button.
- Then click on the search input field and enter "OAuth1".
- Then select "OAuth1 API" from the list.
- Then click on the "Continue" button.
- Then fill in the required credential details.
- Finally click on the "Connect" button.

