This is the background material, occassion and purpose of which letter?
Paul intended to return to Corinth after staying in Ephesus and announces his plan to them to visit before and after his travels to Macedonia. However, on his was to Macedonia, he ended up dealing with a man who opposed him to his face and found out some of the church agreed with this man, which lead Paul to say it was a "painful visit." To avoid further pain to himself or the church, he decided to send a letter instead of coming in person so the letter was blunt about the offense and transparent about Paul's deep love for the Corinthians. He was axious about the response to the first letter so he sent a follow up letter to Titus. Paul went to Troas, then Macedonia looking for Titus but finding a man that repented under the discipline of the Corinthians and the fellowship through godly sorrow had been reconciled back to Paul.
Occasion and Purpose:
Paul responds to them about Titus's good report of reconciliation.
Collection for the poor in Jerusalam
Gives arguments for the collection and how it is to be handled.
Addresses Paul's opponents
Might not be a single letter since there is an appearance of another group of opponents to Paul seen in Ch 10-13