Whistl Onboarding Requirements and Configuration Guides [Information]

Last updated: September 29, 2026

Onboarding and ConfigurationBaseline Account(Billing) AccountOrder-Level Fields
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This article is the central hub for adding Whistl with techSHIP. It summarizes onboarding requirements, links the related configuration guides, and lists confirmed carrier-specific constraints.

   

   

  

To review all supported carriers and their specific requirements, see: techSHIP supported Carriers - Master List [Guides List].

   

   

TABLE OF CONTENTS



Onboarding Requirements



Before configuring Whistl in techSHIP, gather the required credentials and verify the required account settings.



Information to be Provided



The following credentials and data points are mandatory to establish the connection. Ensure you have these items available before starting the setup:

     

DATA ELEMENTSOURCE (HOW TO OBTAIN)
API UsernameProvided by Whistl or the customer’s Whistl account representative.
API PasswordProvided by Whistl or the customer’s Whistl account representative.
Account NumberProvided by Whistl for the customer account.
Sender AddressConfirmed by the customer and used as the sender address for the carrier connection.

   

Settings to be Verified



The following account configurations must be validated to prevent errors during the connection setup or the shipping process:

   

FEATURE/SETTINGVALIDATION ACTION
EnvironmentConfirm whether the account is configured for Test or Prod.
Label FormatConfirm the label format required for the operation: ZPL, PDF, or PNG.
Service CodeConfirm the Whistl service selection to use in the Client (Billing) Account.

   

Setup Articles



Use the setup articles below to complete the set up in order. Start with onboarding requirements, then configure the Baseline Account, Client (Billing) Account, and Order-Level Fields. Select an article number to open the corresponding guide:

   

   
COMPONENTONBOARDING REQUIREMENTSBASELINE ACCOUNT(BILLING) ACCOUNTORDER-LEVEL FIELDS
Mandatory
Mandatory
Mandatory
Mandatory
ScopeRequirementsCarrierClientTransaction
DescriptionIdentifies the required onboarding information and organizes the related setup guides for this carrier.Establishes the carrier connection. Must be created first.Connects a specific client to the Baseline. At least one is required to ship.Defines order-level fields and settings used when processing shipments for this carrier.

   

Carrier Specifications and Constraints



This section outlines confirmed operational behaviors, document support, label support, and limitations specific to this carrier.



Labels



The following table summarizes confirmed document and label support:

    

ITEMSUPPORTED
LabelSupported
ReferencesSupported
BOLNot supported

   

The table below specifies the hard limits for Label References enforced by the carrier. Data exceeding these limits may be truncated on the physical label or cause manifest errors:

   

CONSTRAINT TYPELIMIT/REQUIREMENTNOTES
Label References2 referencesReference 1 and Reference 2 are supported.

   

   

   

  

For a comprehensive guide on how to use label references, see: Using order References in your labels [Step-by-Step guide].

   

   

Next Steps



After reviewing the onboarding requirements, continue with the Reference Data: Whistl Baseline Account Fields [Guide] article to configure the carrier connection in techSHIP.

   

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Onboarding and ConfigurationBaseline Account(Billing) AccountOrder-Level Fields