3DS ReferenceProtocol & field guide

EMV 3-D Secure · Core specification 2.3.1.1

Default-SDK TypedefaultSdkType

Default-SDK Type in Authentication Request (AReq).

Source edition: Core 2.3.1.1 · Type: Object · Length: 2 characters · Minimum length: 2 · Maximum length: 2

Baseline in AReq Conditional

Varies by context. Requirement or applicability varies by channel or message category. Select a specific context to resolve it. Usage and conditions ↓

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Usage in AReq

Indicates the characteristics of a Default-SDK. SDK Variant: SDK implementation characteristics Wrapped Indicator: If the Default-SDK is embedded as a wrapped component in the 3DS Requestor App Example: " " defaultSdkType :{ " " " " sdkVariant : 01 , " " " " wrappedInd : Y }

Conditional inclusion — source text

Required if SDK Type = 01

Related condition fields: sdkType.

Format and scope

Type: Object · Length: 2 characters · Minimum length: 2 · Maximum length: 2

Source components: 3DS Server. Channels: 01-APP. Categories: 01-PA, 02-NPA.

Object members

Nested presence rules apply when the parent is supplied. Consult the source for full conditions.

sdkVariant — SDK Variant

SDK implementation characteristics

Type: String · Length: 2

ValueMeaningIntroduction tag
01NativeNot tagged
02–79Reserved for EMVCo future use (values invalid until defined by EMVCo)Reserved
80–99Reserved for DS useReserved

Introduction tags are shown where recorded. An absent tag does not establish when a value was introduced.

wrappedInd — Wrapped Indicator

If the Default-SDK is embedded as a wrapped component in the 3DS Requestor App

Type: String · Length: 1

ValueMeaningIntroduction tag
YWrapped (only present if value = Y)Not tagged

Introduction tags are shown where recorded. An absent tag does not establish when a value was introduced.

EMV_3DS_CoreSpec_v2.3.1.1_20230530.pdf, Table A.1, PDF pages 243

Scoped FAQ qualifications

  • FAQ 27 — Applicable object-bearing protocol versions

    Only when the parent JSON object is present

    Evaluate nested presence conditions when the parent object is present. In multiTransaction, merchantList is required when the object is supplied; merchantAmount remains optional.

    EMVCo_3DS_Specification_FAQs_8-April-2026.pdf, page 9

  • FAQ 73 — Applicable object-bearing protocol versions

    An optional or conditionally optional field is sent empty

    An empty optional field produces error 203 under Req 309. When the empty JSON object contains mandatory data, error 201 may be returned.

    EMVCo_3DS_Specification_FAQs_8-April-2026.pdf, page 23

Transaction context

This reference covers the published source edition. Use the explorer to inspect this field and any applicable transaction conditions. Scheme programme requirements are not inferred from the protocol edition.

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Sources and related references

EMV_3DS_CoreSpec_v2.3.1.1_20230530.pdf, Table A.1, PDF pages 243

Source review status: carried-forward. Carried-forward material has not acquired a new verification claim.

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