Thank Them, and Ask Them to Thank You _ must be sincere Money is often a touchy subject, so politeness about it is a good idea. Your clients are paying you money that they've earned with blood, sweat and tears, so let them know you appreciate it. You should also invite them to contact you if they have any questions and, more importantly, make it clear that you appreciate their present (and future) business. Some people also welcome testimonials; for example, by adding, "Let us know how we did. Write a testimonial and sent to... " If you're building your website's testimonials page or want to complete the feedback loop, this is a great way to get clients to give feedback on your work. If they have suggestions for making the process smoother, it's also a great opportunity for you to improve.
Electronic invoices contain all of the information required in a traditional, paper invoice in an encrypted format, including data on the sender and recipient, such as their name and Tax ID number, the date of the invoice, the sender's legal address, the amount of the invoice and the percentage and amount of VAT, among other information. Furthermore, the document includes an electronic signature, which is generated using a digital certificate that has been provided to the sender of the invoice by a Tax Agency_approved certificate company. This combination of factors provides a Electronic Invoice with sufficient reliability so as to indisputably guarantee its integrity and the authenticity of its origin.