Get url for magic receipts

Optional set of key-value pairs to be passed back in callbacks. Max 10 pairs with both key and value up to 50 characters long. Keys and values are trimmed and lower-cased. Keys can only contain alphanumeric characters and underscores. Values can contain any characters. If you need to pass sensitive information, note that users can potentially manipulate this data.

Optional cross-provider tracking token for analytics correlation (e.g. comma-separated amp:session_id,other:token). Max 512 characters.