We currently work with Simplex and MoonPay for credit & debit card purchase. You will be using one or the other provider mainly based on which country you are in.
Purchasing through Simplex
Simplex is available in most countries. Consult the full list here: https://www.simplex.com/kb/can-anyone-use-this-service/
If you are purchasing from the United States, please note that the following states are not supported: Georgia (GA), New Mexico (NM), Hawaii (HI), Washington (WA), Oregon (OR), Vermont (VT), Florida (FL), Alabama (AL).
Purchasing through MoonPay
MoonPay is available in those countries: Austria, Belgium, Brazil, Bulgaria, Canada, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hong Kong, Hungary, Iceland, Ireland, Italy, Japan, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Mexico, Netherlands, Norway, Poland, Portugal, Romania, Russia, Slovakia, Slovenia, South Africa, South Korea, Spain, Sweden, United Kingdom, United States.
If you are purchasing from the United States, please note that the following states are not supported: Hawaii (HI), Indiana (IN), Iowa (IA), Kansas (KS), Kentucky (KY), Louisiana (LA), Maine (ME), Mississippi (MS), Nebraska (NE), Nevada (NV), New Mexico (NM), New York (NY), Oklahoma (OK), Rhode Island (RI), Utah (UT), West Virginia (WV).
Consult the full list here: