Intermediary banks are different from paying banks and receiving banks, and they only assume the role of fund transfer in the process of international remittance. How to understand it?
In many cases, because there is no direct business relationship between remitting bank A and receiving bank B, it is not very convenient to settle accounts. Just like two people know each other's names, but they are not familiar with them, and they need a third party C recognized by both sides as a transit. This C has business dealings with other banks, so the middle banks are generally big banks with strong international settlement ability and strength. More colloquially, it's like flying from Shanghai to Switzerland. In many cases, there is no direct route, so you need to choose a transit.