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Note:

The field will be disregarded if it is marked as optional and the format provided is incorrect. However, a validation error will be displayed if the field is marked as mandatory and the format provided is incorrect.

"+" - means required (for all flows)
"-" - means not required (for any flow)
For instance, in POST Create Charge flow:
+6 means that the field is required for flow number 6
-6 means that the field is not required for flow number 6

Tokens

One-time token represents payment source information including Credit cards or Direct Debit account details. It is a disposable token for creating charges/subscriptions/customers or updating customers. One-time tokens expire after 3 hours.