Update an existing crypto return policy

The address to which the refund will be sent. Required if the strategy is static_address, but must be unset if the strategy is refund_to_sender.

The memo to include with the refund transaction. Must be unset if the strategy is refund_to_sender.

The blockchain on which the refund will be sent. Required if the strategy is static_address, but must be unset if the strategy is refund_to_sender.

The currency to which the refund will be sent. Required if the strategy is static_address, but must be unset if the strategy is refund_to_sender.

The strategy to use for the refund. Can be refund_to_sender or static_address. We only support multiple policies for static_address; different strategies cannot have multiple policies. If multiple static_address policies exist, the policy that matches both the currency and chain will be used first. If no such policy is found, the policy that matches only the currency will be used instead.