I am looking for top-notch WHMCS choices for ACH payments, with emphasis on the provider's quality of service. I seek fast response times and availability of the WHMCS plugin.
Additionally, while ACH is only available in the United States, I welcome any recommendations for similar options in other countries.

Thank you very much.

I highly recommend using Stripe as the billing system for your WHMCS needs. Additionally, a free module called moStripe is available for use.
For those who prefer to use Electronic Verification (ACH), authorize.net and bluepay also offer compatible modules through direct integration with WHMCS.

It's interesting to note that Stripe has become a popular choice for payment processing due to its user-friendly interface and reliable service. The availability of a free plugin like moStripe only adds to its appeal. On the other hand, authorize.net and bluepay offer more traditional payment methods, but their direct integration with WHMCS may offer extra convenience for some users.

When it comes to top-notch WHMCS choices for ACH payments in the United States, there are a few providers known for their quality of service and the availability of WHMCS plugins. Some popular options include:

1. Stripe: Stripe is a popular payment provider that offers ACH payments in the United States. They have a well-documented API and provide a WHMCS plugin for seamless integration.

2. Authorize.Net: Authorize.Net is another widely used payment gateway that supports ACH transactions. They offer a feature-rich WHMCS plugin and have a reputation for excellent customer support.

3. PayPal: While PayPal is primarily known for its online payment services, they also offer ACH payments through their platform. They provide a WHMCS plugin that allows easy integration and support for ACH payments.

When it comes to similar options in other countries, the availability of ACH-like services may vary. However, some alternatives you can consider include:

1. Direct Debit (SEPA): If you are looking for a similar payment option in Europe, SEPA (Single Euro Payments Area) Direct Debit is widely used. Providers like GoCardless offer WHMCS plugins for SEPA Direct Debit payments.

2. BACS (Bankers Automated Clearing Services): In the United Kingdom, BACS is the primary method for electronic payments. Providers such as SagePay and WorldPay offer WHMCS plugins with BACS support.

Here are a few more options for WHMCS choices for ACH payments and similar options in other countries:

ACH Payment Providers in the United States:
1. Dwolla: Dwolla is a payment platform that offers ACH payments with a focus on simplicity and security. They provide a WHMCS plugin for easy integration.

2. BlueSnap: BlueSnap is a global payment gateway that supports ACH payments in the United States. They offer a WHMCS plugin and have a reputation for reliable service.

ACH-like Payment Options in Other Countries:
1. iDEAL (Netherlands): If you are looking for an ACH-like payment option in the Netherlands, iDEAL is widely used. Providers like Mollie and Sisow offer WHMCS plugins to seamlessly integrate iDEAL payments.

2. POLi (Australia and New Zealand): POLi Payments is an online payment method popular in Australia and New Zealand. They offer a WHMCS plugin that allows easy integration with your billing system.

3. Interac e-Transfer (Canada): Interac e-Transfer is a widely used payment method in Canada. While there may not be a specific WHMCS plugin available, you can explore custom integration options or consult with local payment processors like Payfirma or Moneris.