The maximum accepted amount for tips in the smallest units of the currency (integer, not float/double). For example, for a maximum tip of US$1.45 pass max_tip_amount=145. See the exp parameter in currencies.json, it shows the number of digits past the decimal point for each currency (2 for the majority of currencies). Defaults to 0
A JSON-serialized array of suggested amounts of tips in the smallest units of the currency (integer, not float/double). At most 4 suggested tip amounts can be specified. The suggested tip amounts must be positive, passed in a strictly increased order and must not exceed max_tip_amount.