An H-1B visa is a nonimmigrant visa used by American companies who wish to employ foreign workers in occupations that require college degrees or their equivalency. Most occupations for which foreign employees use the visa are in medicine, chemistry, engineering, biotechnology and the social sciences. Employees who are granted H-1B visas may only work for the sponsoring American company.
What Is a Visa?   |   What Is a Travel/Tourist Visa?   |   What Is a Work Visa?   |   What Is a Business Visa?   |   What Is a Student Visa?   |   What Is a Refugee/Asylum Visa?   |   What Is a Working Holiday Visa?   |   What Is a Spousal Visa?   |   What Is a Transit Visa?   |   What Is an eVisa?   |   Immigrant Vs. Nonimmigrant Visas   |   What Does a Visa Look Like?   |   Why Do I Need a Visa to Travel?   |   What Is a Visa Policy?   |   Why Do Certain Countries Have Visa Restrictions?   |   When Do I Need a Visa?   |   How Do I Apply for a Visa?   |   What Are the Requirements for a Visa?   |   What Are the Supporting Documents Required for Visitor Visas?   |   What Is an Invitation Letter for a Visa?   |   What to Expect During a Visa Interview?   |   What Are the Fees for Obtaining a Visa?   |   What Are Visa Processing Times?   |   What Visa Services Does an Embassy Offer?   |   What Can I Learn From the Visa Restrictions Index?   |   Which Countries Can I Travel to Visa-Free?   |   How Are Travel Visas Linked to My Passport?   |   Visa-Free Vs. Visa on Arrival Vs. Visa Required   |   What Are the US Visa Restrictions?   |   Which Countries Can I Visit Visa-Free With the US Passport?   |   How Many Visitor Visas Does the US Accept and Reject Each Year?   |   Which Countries Can I Visit With a Schengen Visa?   |   When Was the First Visa Ever Issued?   |   Global Visa Issuance Over Time
Corporate, government and foreign credit cards are high risk.  They have the highest interchange rates.  You may ask why.  Simply, if someone from a foreign country buys an item here but refuses to pay for it later, perhaps because of a dispute, it is very difficult, sometimes almost impossible to get that money back.  Also, people in corporations and government make purchases that are not authorized by higher management.  If they quit or are terminated, these entities will often dispute the charges as unauthorized.  This makes these three card types high risk.
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