Need a booking bot for a custom pet food subscription plan

We run a small service that prepares individual meal plans for dogs and cats, and right now every new subscriber is processed by hand: a manager chats with the owner, writes down the pet's details, calculates portions, and only then sends a payment link. It works, but it does not scale, and we lose people who simply don't want to wait for a reply. We need a booking bot that walks a customer through the whole signup on its own, inside a messenger or as a widget on our site, and hands us a ready order instead of a raw conversation.

The bot should ask for the animal type, breed if relevant, age, current weight and target weight, activity level, any known allergies or health conditions (kidney issues, diabetes, sensitive stomach and so on), and how often the owner wants deliveries — weekly, every two weeks, or monthly. Based on the answers it should suggest a plan tier and a starting price, let the customer confirm or adjust portion size, collect the delivery address, and move to payment. After payment it should send a confirmation with the next delivery date and store everything in a simple format we can import into our order sheet.

We are open to Telegram, WhatsApp, or a website chat widget — whichever is easier to maintain long term. Please tell us in your proposal which platform you'd recommend and why, and how you'd structure the health-questionnaire logic so it stays easy for us to edit later without touching code.

Requirements:
— Step-by-step questionnaire: animal type, breed, age, weight, activity, health notes, allergies
— Delivery frequency selection with clear recurring schedule logic
— Plan and price suggestion based on the answers, editable by us later
— Payment step with at least one card processor integrated
— Order confirmation message and a simple export or admin view of collected orders
— Editable question texts and pricing rules without a developer for every change