Create an exchange for a customer

Creates an exchange connection between a customer and Dwolla. Request body varies by partner (Plaid, MX, Flinks, Finicity, Checkout.com). For bank accounts, use Plaid, MX, Flinks, or Finicity to establish secure access to the customer's bank account data. For debit cards (Push to Card), use Checkout.com and pass the payment ID from Checkout.com Flow.