Response field cost_basis removed

What changed

Reads of this field return undefined, and the failure surfaces wherever that value is used rather than at the call.

Affects AssetReportInvestmentHolding reachable from 3 operations.

Who is affected

Code that reads Plaid's AssetReportInvestmentHolding objects, used by 3 Plaid operations.

Before and after

Code that breaks

// response.cost_basis is now undefined
const cost_basis = response.cost_basis;

Based on Plaid’s published API specification. How severity is decided.