Latvia visa requirements for Thais

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• A
  Latvian tourist visa is a visa issued to a foreigner visiting Latvia
  for tourism, visitation, sight-seeing, and other recreational
  purposes.
• Thailand
  citizens who intend to visit friends and relatives in Thailand or
  vacation can apply for this visa.
• An
  international passport not older than 10 years with a validity
  period of three months beyond your exit date in Latvia is required.
  The passport must have two blank pages for visa stamps.
• Copies
  of the Latvian tourist visa application form.
• Two
  recently taken passport photographs not more than a month.
• A
  letter stating the purpose of your visit to Latvia and the duration
  of your stay in the country.
• Proof
  of your employment status and income are required.
• Travel
  health insurance amounting to 30,000 euros to cover your duration of
  stay in the country and other Schengen countries.
• Copy
  of flight reservation.
• Proof
  of legal residents in your origin country. This could be your utility bills for previous months.
• Proof
  of accommodation or hotel reservations in Latvia.
• Bank
  statements of the last six months to show proof of sufficient funds
  to cover expenses while in Latvia.
• Employed
  applicants are required to submit their letter of appointment, leave
  letter, payment slips and bank statements for the last six months.
• Self-employed
  applicants are expected to submit the following documents: Tax
  Clearance Certificate, Memorandum of Articles of Association,
  Certificate of Incorporation of Company, Certificate of
  Registration, Personal Income Certificate, letter of introduction
  and their personal and business bank statements for the past six
  months.
• If
  you are a student you are required to submit an attestation letter from your school stating that the school authority is aware of your absence. The letter may not be needed if the school is on long term vacation.
• Retired
  applicants are required to show proof of retirement and bank
  statements of the last six months where their pension is been
  deposited.
• Minors
  traveling without their parents are required to submit a consent
  letter signed by both parents stating that they are aware of your
  trip. Applicants traveling with one parent are expected to submit a
  consent letter signed by the absent parent.
• Minors
  traveling are required to submit a copy of their birth certificate.

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• Latvia
  medical visa is a visa issued to foreigners who intend to get proper
  medical treatment in Latvia.
• A
  duly completed and signed medical visa application form is required.
• Latvia
  short stay medical visa is valid for a duration of 90 days.
• Applicants
  who intend to stay in Latvia for longer than 90 days to receive medical treatment must apply for a long stay national visa for medical treatments.
• A
  passport with at least six months validity and blank passport pages
  for visa stickers must be provided.
• A
  local medical report from a hospital in Thailand stating the need
  for the patient transfer to Latvia must be submitted.
• Travel
  medical insurance with a minimum coverage of 30,000 euros valid for
  the period of your stay in Latvia.
• Proof
  of paid medical fee.
• A
  medical attestation from the hospital or doctor in Latvia,
  confirming the date of your appointment as well as your medical
  situation.
• Proof
  of sufficient funds to cover your medical fee and other expenses while in Latvia.
• A
  copy of your flight return ticket after the expiry of your medical
  visa.
• Proof
  of paid Latvian medical visa application form.
• A
  Guarantee letter confirming that the patient will be able to provide for any additional costs arising during the treatment in Latvia. 

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• The
  Latvian business visa is a short-term Schengen visa issued to
  foreigners visiting Latvia for business transactions.
• Thailand
  citizens who intend to attend trade fairs, conferences, business
  meetings or to sign business deals in Latvia can apply for this
  visa.
• The
  Latvian visa allows foreigners to stay and travel within Latvia for
  a duration of 90 days.
• A
  duly completed and signed Latvian business visa application form is
  required.
• A
  passport with at least three months validity and two blank pages for
  visa stickers is required.
• Recently
  taken passport sized photographs.
• A
  letter from the inviting company in Latvia is required. The letter
  must state the detailed address of the company and your travel dates
  and the purpose of your visit to the country.
• Travel
  health insurance with a minimum coverage of 30,000 euros to cover
  accidents or illness while in the Schengen area.
• A
  letter from your employer stating that he is aware of your business
  trip is required.
• A
  letter stating if the Latvian company or your employer is
  responsible for your traveling expenses.
• Proof
  of previous business dealings between the two companies is required.
• Bank
  statement of the last six months to show proof of sufficient funds
  to cover your duration of stay in Latvia.
• Proof
  of accommodation or hotel reservations in Latvia.
• Proof
  of paid visa application fee.
• Flight
  returns or onward ticket.