Look up whether a user is known to Trustly
Checks whether a user has previously used Trustly, based on one or more provided identifiers (email, phone, or your own customer ID).
Merchants can use this endpoint early in the payment funnel — before the user reaches the payment selection screen — to determine whether to surface Trustly as the top payment option. A `true` response indicates the user is already familiar with Pay by Bank and is more likely to complete a Trustly-powered transaction.
**How it works:** The lookup queries Trustly's user database across all stored identifiers. If any provided identifier matches a known Trustly user, `isTrustlyUser` is returned as `true`.
**Authentication:** Requests must be authenticated with HTTP Basic Auth using your `accessId` as the username and `accessKey` as the password.
Authentication
AuthorizationBasic
Query parameters
email
User's email address.
externalId
Your external identifier for the Customer.
phone
User's phone number in ITU E.164 format.
Response
Lookup result
isTrustlyUser
True if any provided identifier matches a TRM user.
errorsList
Present only on error responses.
Errors
400
Bad Request Error
401
Unauthorized Error
500
Internal Server Error