In chapter 1, Paul described how his message came from Jesus not from any man. He explained how he received his message independently from the other apostles through revelation from Jesus. Because of this, he was no second-class apostle.
In chapter 2, Paul describes how even though he received his message independently from the other Jerusalem apostles his message was identical to theirs. There is only one gospel.
To prove that his message was identical to the other apostles, Paul stresses how he paid a visit to Jerusalem fourteen years after his conversion.
At this meeting, Paul’s gospel was endorsed and approved by them. And an important word is said about the poor in v 10.