We're working to update our docs as quickly as possible, so transaction stuff will be there soon. As for checks, we're not planning on supporting check deposit via API initially. There are a few reasons:

1. Remote Check Deposit is a protected technology owned by Mitek and/or USAA, and we're limited in how we can use it.

2. Checks are a huge fraud vector, so we're going to be careful about how we support them.

3. Checks are literally the worst payment mechanism ever invented and we would love to see them die in a fire. So we're going to discourage their use as much as possible while providing better, easier to use payment mechanisms.

That having been said, you will be able to deposit checks into SEED, just not via API for now.