ver. 1424 (14cdcbf)
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Exchange authorized Request Token for an Access Token
:: services/oauth/access_token method

Minimum Authentication: Level 3 (see Authentication Levels)
https://opencaching.pl/okapi/services/oauth/access_token

Exchange authorized Request Token for an Access Token. Access Token can be used to access resources of a user who authorized the Request Token.

Standard OAuth "Consumer & Request Token" Authorization arguments are required.

oauth_verifier required Consult OAuth 1.0a documentation for details.
Plus required standard OAuth Consumer signing arguments: oauth_consumer_key, oauth_nonce, oauth_timestamp, oauth_signature, oauth_signature_method, oauth_version. Plus required oauth_token for Token authorization.

Returned value:

Standard OAuth 1.0a Token response - a string in a form-encoded format:

oauth_token=...&oauth_token_secret=...

You must be prepared that there might be more parameters returned in the future (you should ignore them gracefully).