# Field Notes Guides, tips, and insights for Shopify merchants who want to collect fees, recover costs, and boost sales. ## Articles: 1. **[5 Hidden Fees Eating Into Your Shopify Store's Margins (And How to Fix Them)](/content/blog/hidden-fees-eating-shopify-margins/index.html)** Most Shopify merchants are losing money to fees they could be passing on or recovering. Here are the 5 biggest margin killers and practical solutions. 2. **[How to Add Tariff Surcharges to Your Shopify Store (2026 Guide)](/content/blog/how-to-add-tariff-surcharges-on-shopify/index.html)** Learn how to pass tariff costs to customers on Shopify with transparent surcharges. Step-by-step setup guide for the 2025-2026 US tariff wave. 3. **[Bottle Deposit Laws by State: What Every Shopify Merchant Needs to Know](/content/blog/bottle-deposit-laws-by-state/index.html)** A complete guide to US bottle deposit laws by state, including exact deposit amounts, covered products, and how to collect deposits on Shopify. 4. **[How to Add Oversized and Heavy Item Handling Fees on Shopify](/content/blog/oversized-handling-fee-shopify/index.html)** Selling furniture, equipment, or bulk goods on Shopify? Learn how to add oversized and heavy item handling fees to recover true shipping and logistics costs — without surprising customers at checkout. 5. **[Credit Card Surcharge Laws by State: The Complete 2026 Guide](/content/blog/credit-card-surcharge-laws-by-state-2026/index.html)** Which US states allow credit card surcharges? A comprehensive 2026 state-by-state guide covering laws, disclosure requirements, caps, and compliance. 6. **[WEEE and DEEE Compliance on Shopify: How Electronics Sellers Collect Eco-Participation Fees](/content/blog/shopify-weee-deee-eco-fees/index.html)** Selling electronics in the EU or Canada? Understand your WEEE/DEEE obligations and learn how to collect eco-participation fees from your Shopify customers with Canteen. 7. **[The Complete Guide to Mandatory Fees on Shopify (2026)](/content/blog/complete-guide-to-mandatory-fees-on-shopify/index.html)** Everything Shopify merchants need to know about mandatory fees: bottle deposits, environmental fees, tariff surcharges, credit card fees, retail delivery fees, and more. 8. **[Pfand on Shopify: How to Collect German Bottle Deposits for Your Store](/content/blog/pfand-german-bottle-deposit-shopify/index.html)** Selling beverages to customers in Germany? Learn what Pfand (bottle deposit) is, the exact amounts, which products are covered, and how to collect it on Shopify with Canteen. 9. **[The Shopify POS Upsell Playbook: 10 Strategies to Boost Average Order Value](/content/blog/shopify-pos-upsell-playbook/index.html)** 10 proven upsell strategies for Shopify POS merchants. Boost average order value with actionable tactics, real examples, and dollar impact estimates. 10. **[Can You Charge a Service Fee at Shopify POS? What's Legal and How to Do It](/content/blog/shopify-pos-service-fee-legal/index.html)** Wondering if you can add a service fee or credit card surcharge at Shopify POS? Here's the legal landscape and how Chargly helps merchants collect POS fees compliantly. 11. **[How to Add Fees for B2B and Wholesale Orders on Shopify](/content/blog/shopify-b2b-wholesale-fees/index.html)** B2B and wholesale orders come with unique fee challenges. Learn how Shopify merchants can handle ACH fees, net terms, and order minimums using Canteen and Chargly. 12. **[How to Add Cold Pack and Perishable Shipping Fees on Shopify](/content/blog/cold-pack-perishable-shipping-fees-shopify/index.html)** Wineries, florists, butchers, and seafood sellers — learn how to add cold pack and perishable shipping fees to your Shopify store automatically with Canteen. 13. **[Retail Delivery Fee on Shopify: What It Is and How to Collect It](/content/blog/retail-delivery-fee-shopify/index.html)** Learn what retail delivery fees are, which US states require them, the exact amounts, and how Shopify merchants can collect them automatically using Canteen. 14. **[Excise Taxes on Shopify: How Alcohol, Cannabis, and Tobacco Sellers Collect Fees](/content/blog/excise-tax-shopify/index.html)** Selling alcohol, cannabis, tobacco, or fuel on Shopify? Learn what excise taxes are, how they differ from sales tax, and how to collect excise-style fees from your customers using Canteen. 15. **[How to Upsell at the Shopify POS: A Complete Guide](/content/blog/how-to-upsell-at-the-shopify-pos/index.html)** Boost your average order value at Shopify POS with smart upselling strategies. Learn proven techniques and tools for in-store upsells. 16. **[Can You Charge Credit Card Surcharges on Shopify POS? Here's How](/content/blog/can-you-charge-credit-card-surcharges-on-shopify-pos/index.html)** Learn how Shopify POS merchants can add credit card surcharges to recover processing fees. A step-by-step guide to compliant surcharging. 17. **[Shopify Environmental Fee Compliance: A Guide for Merchants](/content/blog/shopify-environmental-fee-compliance/index.html)** Navigate environmental fee regulations on Shopify. Learn about eco-fees, recycling charges, and how to stay compliant with your online store and POS. 18. **[How to Collect Bottle Deposits on Shopify (Online Store & POS)](/content/blog/how-to-collect-bottle-deposits-on-shopify/index.html)** A complete guide to collecting CRV, Pfand, Statiegeld, and container deposits on your Shopify store — both online and at POS.