https://pages.oup.com/ol/cus/1646173949115570121/submit-words-and-evidence-to-the-oed

The modern day digital version of an OED contribution slip includes database fields for the following:

• Submission type (new word or sense of a word; information about origin/etymology; other)
• the word or phrase itself
• the part of speech (noun, verb, adjective, other)
• pronunciation (recording, IPA, rhyming words, etc.)
• the definition or sense number as defined in the OED
• quotation evidence with full text, and bibliographical references/links)
• additional notes

Only the first two fields are mandatory.