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If I charge for a donation or a product and transfer to PayPal, I know that PayPal charges a fee based on the amount of the sale. Does Squarespace add anything to that fee? In other words, when I collect money through PayPal they charges a service charge. But is there an additional service charge from Squarespace?

Hopefully, I will be on monthly for a few months and then switch to annual. But if things don't work out, can I simply cancel my subscription and owe no more?

I plan on building a site for a small non-profit. Until I get board approval, I expect to pay monthly for about three months. At that time, can I switch to the annual plan?