Ok, after some research. topic_0 is the hash of the method signature. I used https://emn178.github.io/online-tools/keccak_256.html to generate the hash.

In this case the method I want is Transfer(address,address,uint256) and the hash is ddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef

topic_1 is the 1st parameter of the method, which is the from address. I don't want to specify this. Instead I want to specify the to address which is topic_2. topic_2 must be 66 chars, so I padded the destination address with zeros. So topic_2=0x000000000000000000000000Bcef3db86DCcDa6CA1fdBba91Abd525c8D3BF363

This gives me a list of all ERC20 tokens transferred to the destination address. Now I need to figure out how to tell what token and how many were transferred for each record.

Ok, after some research. topic_0 is the hash of the event signature. I used https://emn178.github.io/online-tools/keccak_256.html to generate the hash.

In this case the event I want is Transfer(address,address,uint256) and the hash is ddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef

topic_1 is the 1st parameter of the method, which is the from address. I don't want to specify this. Instead I want to specify the to address which is topic_2. topic_2 must be 66 chars, so I padded the destination address with zeros. So topic_2=0x000000000000000000000000Bcef3db86DCcDa6CA1fdBba91Abd525c8D3BF363

This gives me a list of all ERC20 tokens transferred to the destination address. Now I need to figure out how to tell what token and how many were transferred for each record.