get https://api.sb.spidrsrv.com/v1/achaccount/list
Use /achaccount/search to fetch details about all ACH accounts created via the Create ACH Account endpoint and linked to the given account. This endpoint is similar to Get ACH Account Info, except that it returns an array of all ACH accounts currently linked to the account.
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The total number of linked ACH accounts allowed will depend on your program setup and agreement with your partner bank. Most banks limit the number of ACH account linkages per account to manage risk.