The OmniStudio tool that the consultant should recommend to generate the pre-filled PDF is DataRaptor. A DataRaptor is a tool that can read, transform, and write data from Salesforce objects or JSON objects. A DataRaptor Load can write data to a PDF template using a PDF mapping file, and generate a PDF document with the contact information pre-filled. The PDF document can be stored as an attachment or a content document in Salesforce

The key difference between Integration Procedures and DataRaptors is that Integration Procedures can access data from external sources, while DataRaptors can only access data from Salesforce. Integration Procedures allow the designer to create complex API queries declaratively using HTTP Actions or SOAP Actions.
DataRaptors allow the designer to read, transform, and write data between Salesforce objects or fields. Both Integration Procedures and DataRaptors can invoke multiple actions in a single server call, and both can retrieve data from multiple related objects.

The two scenarios where a DataRaptor should be used are: to retrieve an account and its related contacts, and to merge the city and state fields into a single field. A DataRaptor is a tool that can read, transform, and write data from Salesforce objects or JSON objects. A DataRaptor Extract can retrieve data from one or more Salesforce objects using SOQL queries, and store it in an Interface object or a JSON object. A DataRaptor Transform can map data from one Interface object or JSON object to another, and apply formulas and functions to transform the data. For example, a DataRaptor Transform can concatenate two fields into one using the + operator

The three OmniStudio features and tools that the consultant should recommend to meet these requirements are: OmniScript, Custom Styles, and Newport Design System. An OmniScript is a tool that can design customer interactions using elements and actions. The consultant can use OmniScripts to create the guided processes for the public website. A Custom Style is a feature that allows applying custom CSS properties to an OmniScript or a FlexCard element. The consultant can use Custom Styles to style the OmniScripts using the corporate branding kit, such as colors, fonts, and icons. A Newport Design System is a tool that provides a set of predefined styles and components for building user interfaces. The consultant can use Newport Design System to style the user interface elements in the OmniScripts, such as radio buttons, slide bars, etc., according to the website's style guide