Custody Account Opening Workflow

Step 1: Create Party

POST /v3/createParty — Create an individual party record for the account owner.

Required fields: firstName, lastName, dob, socialSecurityNumber, emailAddress, primary address fields (primAddress1, primCity, primState, primZip)

Set partyType to IndivACParty
This triggers automated KYC/AML checks — the response includes KYCstatus and AMLstatus

Docs: https://transactapi.readme.io/reference/createparty

Step 2: Create Account

POST /v3/createAccount — Create the investor account.

Required fields: accountName, type (e.g. individual), address1, city, state, zip, country, taxID

Docs: https://transactapi.readme.io/reference/createaccount

Step 3: Link Party to Account

PUT /v3/createLink — Establish the ownership relationship.

Parameter	Value
`firstEntry`	accountId
`firstEntryType`	`Account`
`relatedEntry`	partyId
`relatedEntryType`	`IndivACParty`
`linkType`	`Owner`
`primary_value`	`true`

Docs: https://transactapi.readme.io/reference/createlink

Step 4: Attest Custody Agreement (Required)

POST /v3/createCustodyAgreementAttestation — This is a hard requirement before submitting the custody account request.

accountId — the account to attach custody to
isAttested = true
documentUrl — must be a valid, accessible URL pointing to the custody agreement

This records that the account holder has reviewed and accepted the custody agreement terms.

Docs: https://transactapi.readme.io/reference/createcustodyagreementattestation

Optional: DocuSign eSignature

POST /v3/createCustodyAgreementEsign — Sends the custody agreement via DocuSign to the primary party's email for formal eSignature. This is supplementary to the attestation, not a replacement for it.

Step 5: Create Custody Account Request

POST /v3/createCustodyAccountRequest — Submits the account for review.

Only requires accountId
Pre-requisites: party linked to account, attestation on file
Returns a custAccRequestID with initial status of Pending

Docs: https://transactapi.readme.io/reference/createcustodyaccountrequest

Step 6: Monitor Status

Webhooks

Configure your webhook URL in your client settings. Notifications are sent on these events:

Event	Trigger
`Create-Custodial-Account`	Request created
`approveCustodyAccountRequest`	Status changed
`updateCustodyAccountRequest`	Status changed

The webhook payload includes accountId, custAccRequestID, and custAccStatus.

Retrieve Status

Retrieve the current status of a custody account at any time: https://transactapi.readme.io/reference/custodyaccountsid

Status Values

Status	Description
`Pending`	Initial state
`Need More Info`	Additional information required
`Approved`	Account is open and active
`Rejected`	Application denied

Processing Schedule

Account openings are processed daily at 8:00 AM MT, with statuses updated by 10:00 AM MT.