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Get a new unauthorized OAuth Request Token
:: services/oauth/request_token method

Minimum Authentication: Level 2 (see Authentication Levels)
https://opencaching.pl/okapi/services/oauth/request_token

Get a new unauthorized OAuth Request Token. This token is bound to the Consumer it was issued to. It has a short expiration date and can be used in one way only - first it has to get authorized by the user, then it has to be exchanged for an Access Token.

oauth_callback required

URL which you want a User to be redirected to after a successful Request Token Authorization (see "authorize" method). If the client is unable to receive callbacks, the parameter must be set to "oob", OKAPI will provide a user with a PIN code (oauth_verifier) in this case.

Consult OAuth documentation for details.
Plus required standard OAuth Consumer signing arguments: oauth_consumer_key, oauth_nonce, oauth_timestamp, oauth_signature, oauth_signature_method, oauth_version.

Returned value:

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

oauth_token=...&oauth_token_secret=...&oauth_callback_confirmed=true

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