Our recommendation
Payment Link
Based on your answers we recommend you to use Payment Link. It's a link you can send to your customer, and it will take them to a Dojo Prebuilt Checkout Page for them to complete the payment. The payment page works across different devices and can be customized. With the payment links, you can sell online without a website. You could send the payment links after interacting with your customer through chat or email, or any other channel.
This solution is PCI compliant, you are required to submit Self-Assessment Questionnaire A.
You can create payment links either in the Dojo App, or using the Dojo API:
Dojo App Create each payment link manually using Dojo App.
API step-by-step guide Generate payment links automatically through the API.