Add the following text to your marketplace's Terms of Service. Don't forget to replace [MSP] with your marketplace's name.
[MSP NAME] uses Braintree, a division of PayPal, Inc. (Braintree) for payment processing services. By using the Braintree payment processing services you agree to the Braintree Payment Services Agreement available at https://www.braintreepayments.com/legal/gateway-agreement, and the applicable bank agreement available at https://www.braintreepayments.com/legal/cea-wells. If you have questions regarding the MSA, please contact Braintree at 877.434.2894.
Cards from outside the following European countries will incur additional fees:
Andorra, Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark (including Faroe Islands & Greenland), Estonia, Faroe Island, Finland, France (including French Guiana, Guadeloupe, Martinique, Reunion, Mayotte, Saint Barthelemy, Saint Martin [French Part])), Germany, Gibraltar, Greece, Greenland, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxemburg, Malta, Monaco, Netherlands, Norway (including Svalbard and Jan Mayen, Antartica), Poland, Portugal, Romania, San Marino, Slovakia, Slovenia, Spain, Sweden, Switzerland, United Kingdom (including Falklands, Gibraltar, Guernsey, Isle of Man, Jersey, Saint Helena, Ascension and Tristan Da Cunha Helena, South Georgia and the South Sandwich Islands)]