A payment provider is a broader term, referring to the company that offers the entire payment service, which may include the gateway, the tools to manage payments, and other financial services like merchant accounts.

Here are a few well-known and reputable payment providers:

1. PayPal – One of the most popular and widely used payment providers, offering both a payment gateway and merchant services.

2. Stripe – Known for its easy integration and flexibility, Stripe is a favorite for online businesses of all sizes.

3. Square – Popular for both online and in-person payments, Square provides a full suite of payment services, including hardware for physical stores.

4. Authorize.Net – A long-established provider offering secure payment gateways and additional tools for managing online transactions.

5. Braintree – A subsidiary of PayPal, Braintree offers a range of payment solutions, including support for mobile payments and international transactions.

These providers are reputable for their security measures, ease of use, and widespread acceptance across various platforms.