They appear to bundle pledges by the creator's numeric ID, so if you pledge $1 to 15 creators who signed up today, you'll get charged one transaction - but if y

They appear to bundle pledges by the creator's numeric ID, so if you pledge $1 to 15 creators who signed up today, you'll get charged one transaction - but if you pledge $1 to 15 creators who signed up at various times over 3 years, you'll get charged up to 15 transactions. It's incredibly confusing as a customer to see this occurring, since I ended up at one point where one transaction contained a single pledge and the second contained ten of them.