post
https://sandbox.lynx-fh.co/payments/member/contribute
This API is invoked to initiate a member directed contribution from the member's external account into the HSA account. The API takes in an identifier to a linked bank account that is used as the source for the transfer. The linked account must be verified by Plaid and setup on Lynx before invoking this API. Please see the API section 'External Account API' for information on how to link an external account.