Amount associated with the source. This is the amount for which the source will be chargeable once ready. Required for single_use sources. Not supported for receiver type sources, where charge amount may not be specified until funds land.
Either reusable or single_use. Whether this source should be reusable or not. Some source types may or may not be reusable by construction, while others may leave the option at creation. If an incompatible value is passed, an error will be returned.