post
https://api.postgrid.com/print-mail/v1/bank_accounts
Create a bank account. A US bank account is created by setting bankCountryCode to US and providing accountNumber and routingNumber. A canadian bank account can be created by specifying bankCountryCode as CA and setting accountNumber, routeNumber, and transitNumber accordingly.
You must specify either signatureImage or signatureText. The image can be supplied as either a URL or a multipart file upload.