Customer service, reviews and retention
Set up simple service standards, handle reviews honestly and within German rules, and calculate what better retention is worth compared with new customers.
What you will learn
- How to set simple, measurable service standards for a small online business
- How to ask for and answer reviews honestly, including the main German rules (general orientation)
- How to calculate repeat purchase rate and the value of improving it
- Why keeping customers is often cheaper than finding new ones, and when it is not
Explanation
Every buyer who comes back saves the cost of acquiring someone new. Treat service, reviews and retention as one system: good service creates honest positive reviews, reviews help new buyers trust you, and satisfied buyers return.
Service standards
A service standard is a written, measurable promise. Examples:
- First response time: reply to every email within one business day.
- Resolution rate: share of requests solved in the first reply. Higher means clearer answers.
- Ticket rate: requests per 100 orders. If it rises, look for the cause (unclear product page, slow delivery, confusing login).
Keep reply templates for frequent questions, but personalise the first line. Record each request with a short reason code; after a month, the most common code shows which page or process to fix.
Reviews
A review is a public rating or comment from a customer. To get more honest reviews, ask at the right moment: after the customer has had time to use the product, in one short email with a direct link to the review form.
General orientation for Germany (unfair competition law, UWG): you must not write or buy fake reviews, or present reviews in a misleading way, for example by hiding negative ones. If you show customer reviews on your site, you must say whether and how you check that they come from real customers. If you give anything in return for a review, such as a discount, this must be clear. Check the current rules before you start a review programme.
Answer negative reviews calmly and in public: thank the person, state the facts briefly, offer a solution, and move details into private contact. Never publish order details or other personal data in a reply; that would breach data protection rules.
Retention
Retention means customers keep buying or stay subscribed. For a shop with one-off purchases, the key number is the repeat purchase rate:
Repeat purchase rate = customers who bought again within a period ÷ customers in the starting group
A cohort is a group of customers who made their first purchase in the same period, for example all first-time buyers in March. Track each cohort separately, so a strong new month does not hide a weak return rate.
Practical retention tools: a useful follow-up email (how to use the product, not only "buy more"), a printed insert, a refill or next-level product, and fast problem solving. Compare each tool's cost with the extra contribution it brings.
Worked example
Hypothetical example: an online tea shop has 1,000 customers per year. Average order value is €50 and the contribution margin is 40%, so each order contributes €20. Today 20% of customers order a second time within a year. The owner compares two plans for the next year (VAT and fixed costs excluded):
- Retention plan: a follow-up email series and better packaging, costing €300 in total, are expected to raise the repeat rate to 30%. Extra repeat orders: 1,000 × (30% − 20%) = 100. Extra contribution: 100 × €20 = €2,000. Net effect: €2,000 − €300 = +€1,700.
- Acquisition plan: buy 100 new customers with ads at a cost per acquisition of €25. Cost: 100 × €25 = €2,500. Contribution from their first orders: 100 × €20 = €2,000. Net effect on first orders: −€500.
Here retention wins clearly. New customers might still pay off if they reorder later, but that value arrives only over time. The 30% target is an assumption; measure the next cohort's real repeat rate.
Common mistake
Practice activity
Hypothetical: in the first quarter, 250 people bought from your shop for the first time, and 45 of them ordered again within 90 days. After you added a how-to email and a product insert, the second-quarter cohort had 240 first-time buyers, and 60 ordered again within 90 days. Each repeat order contributes €18. On paper: (a) calculate both repeat purchase rates; (b) estimate the extra contribution from the second cohort compared with the old rate. (c) Write a three-sentence public reply to a review saying "Parcel arrived two weeks late, very annoyed."
Show solution
(a) Q1: 45 ÷ 250 = 18%. Q2: 60 ÷ 240 = 25%.
(b) At the old rate, the Q2 cohort would have made 240 × 18% = 43.2 repeat orders. Actual: 60. Difference: 16.8 orders × €18 = €302.40 extra contribution. Subtract the cost of the email and inserts to see the net effect.
(c) Example: "Thank you for telling us, and we are sorry your parcel arrived two weeks late. The delay happened during transport, and we have now changed how we monitor shipments. We have sent you a private message so we can make this right." It thanks, admits the problem, gives a fact and offers private contact, without personal data.
Limitations: two cohorts are a small sample, and other things (season, product mix) may also have changed between quarters.
Key takeaways
- Write measurable service standards and record a reason for every request.
- Ask for reviews honestly, never fake or buy them, and say how you check them.
- Track repeat purchase rate by cohort, and compare retention costs with the extra contribution.
- Retention is often cheaper than acquisition, but check it with your own numbers.
Next step
In the next lesson you get a general orientation on the legal basics for online sellers in Germany: Impressum, terms and the right of withdrawal.
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