When requested for an affiliation number associated with your institution, and if you don't have one, do enter any character (it is a compulsory field, so if not filled in, you will not be allowed to continue with the registration)
If you choose to pay by bank transfer, you will be requested to upload the proof of payment. If you don't have it at the time of registering, you might upload the following form (form.docx or
form.odt) with your information. Then, you will be allowed to finish the registration and you will be given 10 days to go back to the registration platform and upload the proof of payment. Only then, will your registration procedure be validated.