If the you want to use your own native tokens to pay for gas, specify the developer account ID (starts with dac_)
If the user pays in custom tokens, the contract ID (starts with con_) of the token contract.
If the user pays in ERC20 tokens, this reflects either the exchange rate or the amount in WEI.
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If the you want to use your own native tokens to pay for gas, specify the developer account ID (starts with dac_)