Normally, a person wishing to travel (or migrate) to Europe must apply for a visa (for the Schengen area, a Schengen visa) in their country of residence at the embassy, unless they already meet all the requirements of the Commission or Consulate of the (Schengen )country that is his/her main destination. Regarding the countries of the Schengen area, in exceptional cases it is possible to obtain a single-entry Schengen visa with a validity of up to 15 days upon arrival at the border, provided that the person can prove that he does not have it could apply for a visa in advance for reasons of 'unforeseeable' and 'urgent' circumstances, provided he/she meets the regular criteria for issuance of a Schengen visa and can demonstrate all of this together with evidence of the urgency of the situation.

The requirements for entry are as follows:

The third-country national (a person who is neither a citizen of the country in question nor of any other EU country) must be in possession of one or more valid travel documents entitling them to cross the border; the recognition of travel documents for this purpose remains a matter for individual Member States;
The traveler has either a valid visa (if required) or a valid residence permit;
The traveler can justify the purpose and conditions of the intended stay and has sufficient means of subsistence/subsistence both for the duration of the intended stay and for the return to their country of origin or transit to a third country where the traveler is located be safely licensed or able to lawfully acquire such funds;
The Schengen Information System does not contain an alert refusing entry to the traveler and
The traveler is not considered a threat to public order, internal security, public health or international relations of any of the Schengen States - it should be noted that this last rule is the only one that also applies to EU citizens in Germany can be used to refuse them entry.