Link Webview SDK

Reference for integrating with the Link Webview JavaScript SDK

Using webviews to present Link is deprecated. If you're currently integrating this way, we recommend migrating to Hosted Link or one Plaid's official SDKs for Android, iOS, and React Native.

All Webview-based integrations need to extend the Webview handler for redirects in order to support connections to Chase. This can be accomplished with code samples for iOS and Android. For more details, see Extending webview instances to support certain institutions in the OAuth Guide and the in-process Webview deprecation notice. Webview-based integrations that do not extend the Webview handler are not supported by Chase and may be blocked by Chase in the future.

If your integration does not connect to Chase (for example, because you use only Identity Verification, Document Income, or Payroll Income, or you do not support end users in the US) you may ignore this warning.

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Overview

To integrate and use Plaid Link inside a Webview, we recommend starting with one of our sample Webview apps:

Each example app is runnable (on both simulators and devices) and includes code to initialize Link and process events sent from Link to your app via HTTP redirects.

Link webview
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Installation

Link is optimized to work within Webviews, including on iOS and Android. The Link initialization URL to use for Webviews is:

1https://cdn.plaid.com/link/v2/stable/link.html

The Link configuration options for a Webview integration are passed via querystring rather than via a client-side JavaScript call. See the create section below for details on the available initialization parameters.

Communication between Link and your app

Communication between the Webview and your app is handled by HTTP redirects rather than client-side JavaScript callbacks. These redirects should be intercepted by your app. The example apps include sample code to do this.

All redirect URLs have the scheme plaidlink. The event type is communicated via the URL host and data is passed via the querystring.

1plaidlink://

There are three supported events, connected, exit, and event, which are documented below.

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Create

create
isWebview
booleanboolean
Set to true, to trigger the Webview integration.
token
stringstring
Specify a link_token to authenticate your app with Link. This is a short lived, one-time use token that should be unique for each Link session. In addition to the primary flow, a link_token can be configured to launch Link in update mode. See the /link/token/create endpoint for a full list of configurations.
receivedRedirectUri
stringstring
A receivedRedirectUri is required to support OAuth authentication flows when re-launching Link on a mobile device. Note that any unsafe ASCII characters in the receivedRedirectUri in the webview query string must be URL-encoded.
key
deprecatedstringdeprecated, string
The public_key is no longer used for new implementations of Link. If your integration is still using a public_key, see the migration guide to upgrade to using a link_token. See the maintenance guide to troubleshoot any public_key issues.
1https://cdn.plaid.com/link/v2/stable/link.html
2  ?isWebview=true
3  &token="GENERATED_LINK_TOKEN"
4  &receivedRedirectUri=
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connected

The connected event is analogous to the onSuccess callback in Link Web and is sent when a user successfully completes Link. The following information is available from the querystring event:

connected
public_token
stringstring
Displayed once a user has successfully completed Link. If using Identity Verification or Beacon, this field will be null. If using Document Income or Payroll Income, the public_token will be returned, but is not used.
institution_name
stringstring
The full institution name, such as 'Wells Fargo'
institution_id
stringstring
The Plaid institution identifier
accounts
objectobject
A JSON-stringified representation of the account(s) attached to the connected Item. If Account Select is enabled via the developer dashboard, accounts will only include selected accounts.
_id
stringstring
The Plaid account_id
meta
objectobject
The account metadata
name
stringstring
The official account name
number
nullablestringnullable, string
The last 2-4 alphanumeric characters of an account's official account number. Note that the mask may be non-unique between an Item's accounts, it may also not match the mask that the bank displays to the user.
type
stringstring
The account type. See the Account schema for a full list of possible values
subtype
stringstring
The account subtype. See the Account schema for a full list of possible values
verification_status
stringstring
When all Auth features are enabled by initializing Link with the user object, the accounts object includes an Item's verification_status. See Auth accounts for a full list of possible values.
class_type
nullablestringnullable, string
If micro-deposit verification is being used, indicates whether the account being verified is a business or personal account.
transfer_status
nullablestringnullable, string
The status of a transfer. Returned only when Transfer UI is implemented.
  • COMPLETE – The transfer was completed.
  • INCOMPLETE – The transfer could not be completed. For help, see Troubleshooting transfers.


Possible values: COMPLETE, INCOMPLETE
link_session_id
stringstring
A unique identifier associated with a user's actions and events through the Link flow. Include this identifier when opening a support ticket for faster turnaround.
1plaidlink://connected
2  ?public_token=public-sandbox-fb7cca4a-82e6-4707
3  &institution_id=ins_3
4  &institution_name=Chase
5  &accounts='[{"_id":"QPO8Jo8vdDHMepg41PBwckXm4KdK1yUdmXOwK", "meta": {"name":"Plaid Savings", "number": "0000"}, "subtype": "checking", "type": "depository" }]'
6  &link_session_id=79e772be-547d-4c9c-8b76-4ac4ed4c441a
1"accounts": [
2  {
3    "_id": "ygPnJweommTWNr9doD6ZfGR6GGVQy7fyREmWy",
4    "meta": {
5      "name": "Plaid Checking",
6      "number": "0000",
7    },
8    "type": "depository",
9    "subtype": "checking",
10    "verification_status": null
11  },
12  {
13    "_id": "9ebEyJAl33FRrZNLBG8ECxD9xxpwWnuRNZ1V4",
14    "meta": {
15      "name": "Plaid Saving",
16      "number": "1111"
17    },
18    "type": "depository",
19    "subtype": "savings"
20  }
21  ...
22]
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exit

The exit event is analogous to the onExit callback and is sent when a user exits Link without successfully linking an Item, or when an error occurs during Link initialization. Note that on Android devices, an exit event will not be sent if the user exits Link through a system action, such as hitting the browser back button. The following information is available from the querystring:

exit
status
stringstring
The point at which the user exited the Link flow. One of the following values.
requires_questions
User prompted to answer security questions
requires_selections
User prompted to answer multiple choice question(s)
requires_code
User prompted to provide a one-time passcode
choose_device
User prompted to select a device on which to receive a one-time passcode
requires_credentials
User prompted to provide credentials for the selected financial institution or has not yet selected a financial institution
requires_account_selection
User prompted to select one or more financial accounts to share
requires_oauth
User prompted to enter an OAuth flow
institution_not_found
User exited the Link flow on the institution selection pane. Typically this occurs after the user unsuccessfully (no results returned) searched for a financial institution. Note that this status does not necessarily indicate that the user was unable to find their institution, as it is used for all user exits that occur from the institution selection pane, regardless of other user behavior.
institution_not_supported
User exited the Link flow after discovering their selected institution is no longer supported by Plaid
error_type
StringString
A broad categorization of the error.
error_code
StringString
The particular error code. Each error_type has a specific set of error_codes.
error_message
StringString
A developer-friendly representation of the error code.
display_message
nullableStringnullable, String
A user-friendly representation of the error code. null if the error is not related to user action. This may change over time and is not safe for programmatic use.
institution_name
stringstring
The full institution name, such as Wells Fargo
institution_id
stringstring
The Plaid institution identifier
link_session_id
stringstring
A unique identifier associated with a user's actions and events through the Link flow. Include this identifier when opening a support ticket for faster turnaround.
request_id
stringstring
The request ID for the last request made by Link. This can be shared with Plaid Support to expedite investigation.
1plaidlink://exit
2  ?status=requires_credentials
3  &error_type=ITEM_ERROR
4  &error_code=ITEM_LOGIN_REQUIRED
5  &error_display_message=The%20credentials%20were%20not%20correct.%20Please%20try%20again.
6  &error_message=the%20credentials%20were%20not%20correct
7  &institution_id=ins_3
8  &institution_name=Chase
9  &link_session_id=79e772be-547d-4c9c-8b76-4ac4ed4c441a
10  &request_id=m8MDnv9okwxFNBV
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event

The event message is analogous to the Link Web onEvent callback and is called as the user moves through the Link flow. The querystring will always contain all possible keys, though not all keys will have values. The event_name will dictate which keys are populated.

event
event_name
stringstring
A string representing the event that has just occurred in the Link flow.
AUTO_SUBMIT_PHONE
The user was automatically sent an OTP code without a UI prompt. This event can only occur if the user's phone phone number was provided to Link via the /link/token/create call and the user has previously consented to receive OTP codes from Plaid.
BANK_INCOME_INSIGHTS_COMPLETED
The user has completed the Assets and Bank Income Insights flow.
CLOSE_OAUTH
The user closed the third-party website or mobile app without completing the OAuth flow.
CONNECT_NEW_INSTITUTION
The user has chosen to link a new institution instead of linking a saved institution. This event is only emitted in the Link Returning User Experience flow.
ERROR
A recoverable error occurred in the Link flow, see the error_code metadata.
EXIT
The user has exited without completing the Link flow and the exit callback is fired.
FAIL_OAUTH
The user encountered an error while completing the third-party's OAuth login flow.
HANDOFF
The user has exited Link after successfully linking an Item.
IDENTITY_MATCH_FAILED
An Identity Match check configured via the Account Verification Dashboard failed the Identity Match rules and did not detect a match.
IDENTITY_MATCH_PASSED
An Identity Match check configured via the Account Verification Dashboard passed the Identity Match rules and detected a match.
INSTANT_MICRODEPOSIT_AUTHORIZED
The user has authorized an instant micro-deposit to be sent to their account over the RTP or FedNow network with a 3-letter code to verify their account.
MATCHED_SELECT_INSTITUTION
The user selected an institution that was presented as a matched institution. This event can be emitted if Embedded Institution Search is being used, if the institution was surfaced as a matched institution likely to have been linked to Plaid by a returning user, or if the institution's routing_number was provided when calling /link/token/create. For details on which scenario is triggering the event, see metadata.matchReason.
MATCHED_SELECT_VERIFY_METHOD
deprecateddeprecated,
The user selected a verification method for a matched institution. This event is emitted only during the legacy version of the Returning User Experience flow.
OPEN
The user has opened Link.
OPEN_MY_PLAID
The user has opened my.plaid.com. This event is only sent when Link is initialized with Assets as a product
OPEN_OAUTH
The user has navigated to a third-party website or mobile app in order to complete the OAuth login flow.
SAME_DAY_MICRODEPOSIT_AUTHORIZED
The user has authorized a same day micro-deposit to be sent to their account over the ACH network with a 3-letter code to verify their account.
SEARCH_INSTITUTION
The user has searched for an institution.
SELECT_BRAND
The user selected a brand, e.g. Bank of America. The SELECT_BRAND event is only emitted for large financial institutions with multiple online banking portals.
SELECT_DEGRADED_INSTITUTION
The user selected an institution with a DEGRADED health status and was shown a corresponding message.
SELECT_DOWN_INSTITUTION
The user selected an institution with a DOWN health status and was shown a corresponding message.
SELECT_FILTERED_INSTITUTION
The user selected an institution Plaid does not support all requested products for and was shown a corresponding message.
SELECT_INSTITUTION
The user selected an institution.
SKIP_SUBMIT_PHONE
The user has opted to not provide their phone number to Plaid. This event is only emitted in the Link Returning User Experience flow.
SUBMIT_ACCOUNT_NUMBER
The user has submitted an account number. This event emits the account_number_mask metadata to indicate the mask of the account number the user provided.
SUBMIT_CREDENTIALS
The user has submitted credentials.
SUBMIT_DOCUMENTS
The user is being prompted to submit documents for an Income verification flow.
SUBMIT_DOCUMENTS_ERROR
The user encountered an error when submitting documents for an Income verification flow.
SUBMIT_DOCUMENTS_SUCCESS
The user has successfully submitted documents for an Income verification flow.
SUBMIT_MFA
The user has submitted MFA.
SUBMIT_OTP
The user has submitted an OTP code during the phone number verification flow. This event is only emitted in the Link Returning User Experience flow.
SUBMIT_PHONE
The user has submitted their phone number. This event is only emitted in the Link Returning User Experience flow.
SUBMIT_ROUTING_NUMBER
The user has submitted a routing number. This event emits the routing_number metadata to indicate user's routing number.
TRANSITION_VIEW
The TRANSITION_VIEW event indicates that the user has moved from one view to the next.
VERIFY_PHONE
The user has successfully verified their phone number. This event is only emitted in the Link Returning User Experience flow.
VIEW_DATA_TYPES
The user has viewed data types on the data transparency consent pane.
error_type
nullablestringnullable, string
The error type that the user encountered. Emitted by: ERROR, EXIT.
error_code
nullablestringnullable, string
The error code that the user encountered. Emitted by ERROR, EXIT.
error_message
nullablestringnullable, string
The error message that the user encountered. Emitted by: ERROR, EXIT.
exit_status
nullablestringnullable, string
The status key indicates the point at which the user exited the Link flow. Emitted by: EXIT
institution_id
nullablestringnullable, string
The ID of the selected institution. Emitted by: all events.
institution_name
nullablestringnullable, string
The name of the selected institution. Emitted by: all events.
institution_search_query
nullablestringnullable, string
The query used to search for institutions. Emitted by: SEARCH_INSTITUTION.
is_update_mode
nullablestringnullable, string
Indicates if the current Link session is an update mode session. Emitted by: OPEN.
match_reason
nullablestringnullable, string
The reason this institution was matched. This will be either returning_user or routing_number if emitted by: MATCHED_SELECT_INSTITUTION. Otherwise, this will be SAVED_INSTITUTION or AUTO_SELECT_SAVED_INSTITUTION if emitted by: SELECT_INSTITUTION.
mfa_type
nullablestringnullable, string
If set, the user has encountered one of the following MFA types: code, device, questions, selections. Emitted by: SUBMIT_MFA and TRANSITION_VIEW when view_name is MFA
view_name
nullablestringnullable, string
The name of the view that is being transitioned to. Emitted by: TRANSITION_VIEW.
ACCEPT_TOS
The view showing Terms of Service in the identity verification flow.
CONNECTED
The user has connected their account.
CONSENT
We ask the user to consent to the privacy policy.
CREDENTIAL
Asking the user for their account credentials.
DATA_TRANSPARENCY
We disclose the data types being shared.
DATA_TRANSPARENCY_CONSENT
We ask the user to consent to the privacy policy and disclose data types being shared.
DOCUMENTARY_VERIFICATION
The view requesting document verification in the identity verification flow (configured via "Fallback Settings" in the "Rulesets" section of the template editor).
ERROR
An error has occurred.
EXIT
Confirming if the user wishes to close Link.
INSTANT_MICRODEPOSIT_AUTHORIZED
The user has authorized an instant micro-deposit to be sent to their account over the RTP or FedNow network with a 3-letter code to verify their account.
KYC_CHECK
The view representing the "know your customer" step in the identity verification flow.
LOADING
Link is making a request to our servers.
MATCHED_CONSENT
deprecateddeprecated,
We ask the matched user to consent to the privacy policy and SMS terms. Used only in the legacy version of the Returning User Experience flow.
MATCHED_CREDENTIAL
deprecateddeprecated,
We ask the matched user for their account credentials to a matched institution. Used only in the legacy version of the Returning User Experience flow.
MATCHED_MFA
deprecateddeprecated,
We ask the matched user for MFA authentication to verify their identity. Used only in the legacy version of the Returning User Experience flow.
MFA
The user is asked by the institution for additional MFA authentication.
NUMBERS
The user is asked to insert their account and routing numbers.
OAUTH
The user is informed they will authenticate with the financial institution via OAuth.
RECAPTCHA
The user was presented with a Google reCAPTCHA to verify they are human.
RISK_CHECK
The risk check step in the identity verification flow (configured via "Risk Rules" in the "Rulesets" section of the template editor).
SAME_DAY_MICRODEPOSIT_AUTHORIZED
The user has authorized a same day micro-deposit to be sent to their account over the ACH network with a 3-letter code to verify their account.
SCREENING
The watchlist screening step in the identity verification flow.
SELECT_ACCOUNT
We ask the user to choose an account.
SELECT_BRAND
The user selected a brand, e.g. Bank of America. The brand selection interface occurs before the institution select pane and is only provided for large financial institutions with multiple online banking portals.
SELECT_INSTITUTION
We ask the user to choose their institution.
SELECT_SAVED_ACCOUNT
The user is asked to select their saved accounts and/or new accounts for linking in the Link Returning User Experience flow.
SELECT_SAVED_INSTITUTION
The user is asked to pick a saved institution or link a new one in the Link Returning User Experience flow.
SELFIE_CHECK
The view in the identity verification flow which uses the camera to confirm there is real user that matches their ID documents.
SUBMIT_PHONE
The user is asked for their phone number in the Link Returning User Experience flow.
VERIFY_PHONE
The user is asked to verify their phone in the Link Returning User Experience flow.
VERIFY_SMS
The SMS verification step in the identity verification flow.
request_id
stringstring
The request ID for the last request made by Link. This can be shared with Plaid Support to expedite investigation. Emitted by: all events.
link_session_id
stringstring
The link_session_id is a unique identifier for a single session of Link. It's always available and will stay constant throughout the flow. Emitted by: all events.
timestamp
stringstring
An ISO 8601 representation of when the event occurred. For example 2017-09-14T14:42:19.350Z. Emitted by: all events.
selection
nullablestringnullable, string
Either the verification method for a matched institution selected by the user or the Flexible Auth flow type selected by the user. If selection is used to describe selected verification method, then possible values are phoneotp or password; if selection is used to describe the selected Flexible Auth flow, then possible values are flow_type_manual or flow_type_instant. Emitted by: MATCHED_SELECT_VERIFY_METHOD and SELECT_AUTH_TYPE.
1plaidlink://event
2  &event_name=SELECT_INSTITUTION
3  ?error_type=ITEM_ERROR
4  &error_code=ITEM_LOGIN_REQUIRED
5  &error_message=the%20credentials%20were%20not%20correct
6  &exit_status
7  &institution_id=ins_55
8  &institution_name=HSBC
9  &institution_search_query=h
10  &mfa_type
11  &view_name=ERROR
12  &request_id
13  &link_session_id=821f45a8-854a-4dbb-8e5f-73f75350e7e7
14  &timestamp=2018-10-05T15%3A22%3A50.542Z
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OAuth

Using Plaid Link with an OAuth flow requires some additional setup instructions. For details, see the OAuth Guide.

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Supported platforms

Plaid officially supports WKWebView on iOS 10 or later and Chrome WebView on Android 4.4 or later.