> For the complete documentation index, see [llms.txt](https://help.openletterconnect.com/olc-help-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide.md).

# Product & Order Guide

- [Products and Specs](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/products-and-specs.md)
- [Postcards](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/products-and-specs/postcards.md)
- [Personal Letters](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/products-and-specs/personal-letters.md)
- [Professional Letters](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/products-and-specs/professional-letters.md)
- [Additional Pages](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/products-and-specs/professional-letters/additional-pages.md)
- [Snap Pack Mailers](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/products-and-specs/snap-pack-mailers.md)
- [Bi-Fold Self-Mailers](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/products-and-specs/bi-fold-self-mailers.md)
- [Tri-Fold Self-Mailers](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/products-and-specs/tri-fold-self-mailers.md)
- [Real Penned Letters](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/products-and-specs/real-penned-letters.md)
- [Envelope Options](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/envelope-options.md)
- [Sender Fields & Sender Profiles](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/sender-fields-and-sender-profiles.md)
- [What Are Sender Fields?](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/sender-fields-and-sender-profiles/what-are-sender-fields.md)
- [How to Add a Sender Profile](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/sender-fields-and-sender-profiles/how-to-add-a-sender-profile.md)
- [What Happens After You Add a Sender Profile](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/sender-fields-and-sender-profiles/what-happens-after-you-add-a-sender-profile.md)
- [How the Merge Works](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/sender-fields-and-sender-profiles/how-the-merge-works.md)
- [Mail Class Options: First Class vs Standard](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/mail-class-options-first-class-vs-standard.md)
- [Creating a Template](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/creating-a-template.md)
- [Changing the Address Block Color](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/creating-a-template/changing-the-address-block-color.md)
- [Variable Merge Fields & Personalization](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/creating-a-template/variable-merge-fields-and-personalization.md)
- [Adding Mailing Date & Response Date](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/creating-a-template/adding-mailing-date-and-response-date.md)
- [Design Guidelines for Your Mailer](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/creating-a-template/design-guidelines-for-your-mailer.md)
- [QR Code Scan Email Notifications](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/creating-a-template/qr-code-scan-email-notifications.md)
- [QR Codes and Campaign Tracking](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/creating-a-template/qr-codes-and-campaign-tracking.md)
- [Placing an Order](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/placing-an-order.md)
- [Order Processing & Mail Schedule (EST)](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/order-processing-and-mail-schedule-est.md)
- [Importing Contact](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/importing-contact.md)
- [Proper Case in Data Import](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/proper-case-in-data-import.md)
- [Tracking Number](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/tracking-number.md)