Basically, there’re 5 steps required to transfer an NFT.

1. OAuth user to get user’s JWT token

2. Request Mixin API GET /collectibles/outputs with JWT token of the user to get user’s collectible outputs(UTXO). Must carry state argument as unspent.

3. Request Mixin API GET /collectibles/tokens/:token_id , replace :token_id with the token_id from the step 2’s response.

4. Request Mixin API POST /collectibles/requests to create a transaction request. The argument action should be sign. And the argument raw requires some effort to generate.